A social movement is a type of group action. Social movements can be defined as "organizational structures and strategies that may empower oppressed populations to mount effective challenges and resist the more powerful and advantaged elites". They are large, sometimes informal, groupings of individuals or organizations which focus on specific political or social issues. In other words, they carry out, resist, or undo a social change. They provide a way of social change from the bottom within nations.
Modern Western social movements became possible through education (the wider dissemination of literature) and increased mobility of labor due to the industrialization and urbanization of 19th-century societies. It is sometimes argued that the freedom of expression, education and relative economic independence prevalent in the modern Western culture are responsible for the unprecedented number and scope of various contemporary social movements. However, others point out that many of the social movements of the last hundred years grew up, like the Mau Mau in Kenya, to oppose Western colonialism. Either way, social movements have been and continued to be closely connected with democratic political systems. Occasionally, social movements have been involved in democratizing nations, but more often they have flourished after democratization. Over the past 200 years, they have become part of a popular and global expression of dissent.
Modern movements often utilize technology and the internet to mobilize people globally. Adapting to communication trends is a common theme among successful movements. Research is beginning to explore how advocacy organizations linked to social movements in the U.S. and Canada use social media to facilitate civic engagement and collective action. The systematic literature review of Buettner & Buettner analyzed the role of Twitter during a wide range of social movements (2007 WikiLeaks, 2009 Moldova, 2009 Austria student protest, 2009 Israel-Gaza, 2009 Iran green revolution, 2009 Toronto G20, 2010 Venezuela, 2010 Germany Stuttgart21, 2011 Egypt, 2011 England, 2011 US Occupy movement, 2011 Spain Indignados, 2011 Greece Aganaktismenoi movements, 2011 Italy, 2011 Wisconsin labor protests, 2012 Israel Hamas, 2013 Brazil Vinegar, 2013 Turkey).
Political science and sociology have developed a variety of theories and empirical research on social movements. For example, some research in political science highlights the relation between popular movements and the formation of new political parties as well as discussing the function of social movements in relation to agenda setting and influence on politics.
There is no single consensus definition of a social movement. Mario Diani argues that nearly all definitions share three criteria: "a network of informal interactions between a plurality of individuals, groups and/or organizations, engaged in a political or cultural conflict, on the basis of a shared collective identity" 
Sociologist Charles Tilly defines social movements as a series of contentious performances, displays and campaigns by which ordinary people make collective claims on others. For Tilly, social movements are a major vehicle for ordinary people's participation in public politics. He argues that there are three major elements to a social movement:
Sidney Tarrow defines a social movement as "collective challenges [to elites, authorities, other groups or cultural codes] by people with common purposes and solidarity in sustained interactions with elites, opponents and authorities." He specifically distinguishes social movements from political parties and advocacy groups.
The sociologists John McCarthy and Mayer Zald define as a social movement as "a set of opinions and beliefs in a population which represents preferences for changing some elements of the social structure and/or reward distribution of a society." 
According to Paul van Seeters and Paul James defining a social movement entails a few minimal conditions of 'coming together':
(1.) the formation of some kind of collective identity; (2.) the development of a shared normative orientation; (3.) the sharing of a concern for change of the status quo and (4.) the occurrence of moments of practical action that are at least subjectively connected together across time addressing this concern for change. Thus we define a social movement as a form of political association between persons who have at least a minimal sense of themselves as connected to others in common purpose and who come together across an extended period of time to effect social change in the name of that purpose.
The early growth of social movements was connected to broad economic and political changes in England in the mid-18th century, including political representation, market capitalization, and proletarianization. The first mass social movement catalyzed around the controversial political figure, John Wilkes. As editor of the paper The North Briton, Wilkes vigorously attacked the new administration of Lord Bute and the peace terms that the new government accepted at the 1763 Treaty of Paris at the end of the Seven Years' War. Charged with seditious libel, Wilkes was arrested after the issue of a general warrant, a move that Wilkes denounced as unlawful - the Lord Chief Justice eventually ruled in Wilkes favour. As a result of this episode, Wilkes became a figurehead to the growing movement for popular sovereignty among the middle classes - people began chanting, "Wilkes and Liberty" in the streets.
After a later period of exile, brought about by further charges of libel and obscenity, Wilkes stood for the Parliamentary seat at Middlesex, where most of his support was located. When Wilkes was imprisoned in the King's Bench Prison on 10 May 1768, a mass movement of support emerged, with large demonstrations in the streets under the slogan "No liberty, no King." Stripped of the right to sit in Parliament, Wilkes became an Alderman of London in 1769, and an activist group called the Society for the Supporters of the Bill of Rights began aggressively promoting his policies. This was the first ever sustained social movement; -it involved public meetings, demonstrations, the distribution of pamphlets on an unprecedented scale and the mass petition march. However, the movement was careful not to cross the line into open rebellion; - it tried to rectify the faults in governance through appeals to existing legal precedents and was conceived of as an extra-Parliamentary form of agitation to arrive at a consensual and constitutional arrangement. The force and influence of this social movement on the streets of London compelled the authorities to concede to the movement's demands. Wilkes was returned to Parliament, general warrants were declared as unconstitutional and press freedom was extended to the coverage of Parliamentary debates.
A much larger movement of anti-Catholic protest was triggered by the Papists Act 1778, which eliminated a number of the penalties and disabilities endured by Roman Catholics in England, and formed around Lord George Gordon, who became the President of the Protestant Association in 1779. The Association had the support of leading Calvinist religious figures, including Rowland Hill, Erasmus Middleton, and John Rippon. Gordon was an articulate propagandist and he inflamed the mob with fears of Papism and a return to absolute monarchical rule. The situation deteriorated rapidly, and in 1780, after a meeting of the Protestant Association, its members subsequently marched on the House of Commons to deliver a petition demanding the repeal of the Act, which the government refused to do. Soon, large riots broke out across London and embassies and Catholic owned businesses were attacked by angry mobs.
Other political movements that emerged in the late 18th century included the British abolitionist movement against slavery (becoming one between the sugar boycott of 1791 and the second great petition drive of 1806), and possibly the upheaval surrounding the French and American Revolutions. In the opinion of Eugene Black (1963), "...association made possible the extension of the politically effective public. Modern extra parliamentary political organization is a product of the late eighteenth century [and] the history of the age of reform cannot be written without it.
From 1815, Britain after victory in the Napoleonic Wars entered a period of social upheaval characterised by the growing maturity of the use of social movements and special-interest associations. Chartism was the first mass movement of the growing working-class in the world. It campaigned for political reform between 1838 and 1848 with the People's Charter of 1838 as its manifesto - this called for universal suffrage and the implementation of the secret ballot, amongst other things. The term "social movements" was introduced in 1848 by the German Sociologist Lorenz von Stein in his book Socialist and Communist Movements since the Third French Revolution (1848) in which he introduced the term "social movement" into scholarly discussions - actually depicting in this way political movements fighting for the social rights understood as welfare rights.
The labor movement and socialist movement of the late 19th century are seen as the prototypical social movements, leading to the formation of communist and social democratic parties and organisations. These tendencies were seen in poorer countries as pressure for reform continued, for example in Russia with the Russian Revolution of 1905 and of 1917, resulting in the collapse of the Czarist regime around the end of the First World War.
In 1945, Britain after victory in the Second World War entered a period of radical reform and change. In the post-war period, Feminism, gay rights movement, peace movement, Civil Rights Movement, anti-nuclear movement and environmental movement emerged, often dubbed the New Social Movements They led, among other things, to the formation of green parties and organisations influenced by the new left. Some find in the end of the 1990s the emergence of a new global social movement, the anti-globalization movement. Some social movement scholars posit that with the rapid pace of globalization, the potential for the emergence of new type of social movement is latent--they make the analogy to national movements of the past to describe what has been termed a global citizens movement.
Several key processes lie behind the history of social movements. Urbanization led to larger settlements, where people of similar goals could find each other, gather and organize. This facilitated social interaction between scores of people, and it was in urban areas that those early social movements first appeared. Similarly, the process of industrialization which gathered large masses of workers in the same region explains why many of those early social movements addressed matters such as economic wellbeing, important to the worker class. Many other social movements were created at universities, where the process of mass education brought many people together. With the development of communication technologies, creation and activities of social movements became easier - from printed pamphlets circulating in the 18th century coffeehouses to newspapers and Internet, all those tools became important factors in the growth of the social movements. Finally, the spread of democracy and political rights like the freedom of speech made the creation and functioning of social movements much easier.
Sociologists distinguish between several types of social movement:
A difficulty for scholarship of movements is that for most of them, neither insiders to a movement nor outsiders apply consistent labels or even descriptive phrases. Unless there is a single leader who does that, or a formal system of membership agreements, activists will typically use diverse labels and descriptive phrases that require scholars to discern when they are referring to the same or similar ideas, declare similar goals, adopt similar programs of action, and use similar methods. There can be great differences in the way that is done, to recognize who is and who is not a member or an allied group:
It is often outsiders rather than insiders that apply the identifying labels for a movement, which the insiders then may or may not adopt and use to self-identify. For example, the label for the levellers political movement in 17th-century England was applied to them by their antagonists, as a term of disparagement. Yet admirers of the movement and its aims later came to use the term, and it is the term by which they are known to history.
Caution must always be exercised in any discussion of amorphous phenomena such as movements to distinguish between the views of insiders and outsiders, supporters and antagonists, each of whom may have their own purposes and agendas in characterization or mischaracterization of it.
Social movements are not eternal. They have a life cycle: they are created, they grow, they achieve successes or failures and eventually, they dissolve and cease to exist.
They are more likely to evolve in the time and place which is friendly to the social movements: hence their evident symbiosis with the 19th century proliferation of ideas like individual rights, freedom of speech and civil disobedience. Social movements occur in liberal and authoritarian societies but in different forms. However, there must always be polarizing differences between groups of people: in case of 'old movements', they were the poverty and wealth gaps. In case of the 'new movements', they are more likely to be the differences in customs, ethics and values. Finally, the birth of a social movement needs what sociologist Neil Smelser calls an initiating event: a particular, individual event that will begin a chain reaction of events in the given society leading to the creation of a social movement. For example, the Civil Rights Movement grew on the reaction to black woman, Rosa Parks, riding in the whites-only section of the bus (although she was not acting alone or spontaneously--typically activist leaders lay the groundwork behind the scenes of interventions designed to spark a movement). The Polish Solidarity movement, which eventually toppled the communist regimes of Eastern Europe, developed after trade union activist Anna Walentynowicz was fired from work. The South African shack dwellers' movement Abahlali baseMjondolo grew out of a road blockade in response to the sudden selling off of a small piece of land promised for housing to a developer. Such an event is also described as a volcanic model - a social movement is often created after a large number of people realize that there are others sharing the same value and desire for a particular social change.
One of the main difficulties facing the emerging social movement is spreading the very knowledge that it exists. Second is overcoming the free rider problem - convincing people to join it, instead of following the mentality 'why should I trouble myself when others can do it and I can just reap the benefits after their hard work'.
Many social movements are created around some charismatic leader, i.e. one possessing charismatic authority. After the social movement is created, there are two likely phases of recruitment. The first phase will gather the people deeply interested in the primary goal and ideal of the movement. The second phase, which will usually come after the given movement had some successes and is trendy; it would look good on a résumé. People who join in this second phase will likely be the first to leave when the movement suffers any setbacks and failures.
Eventually, the social crisis can be encouraged by outside elements, like opposition from government or other movements. However, many movements had survived a failure crisis, being revived by some hardcore activists even after several decades later.
Sociologists have developed several theories related to social movements [Kendall, 2005]. Some of the better-known approaches are outlined below. Chronologically they include:
Deprivation theory argues that social movements have their foundations among people who feel deprived of some good(s) or resource(s). According to this approach, individuals who are lacking some good, service, or comfort are more likely to organize a social movement to improve (or defend) their conditions.
There are two significant problems with this theory. First, since most people feel deprived at one level or another almost all the time, the theory has a hard time explaining why the groups that form social movements do when other people are also deprived. Second, the reasoning behind this theory is circular - often the only evidence for deprivation is the social movement. If deprivation is claimed to be the cause but the only evidence for such is the movement, the reasoning is circular.
Mass society theory argues that social movements are made up of individuals in large societies who feel insignificant or socially detached. Social movements, according to this theory, provide a sense of empowerment and belonging that the movement members would otherwise not have.
Very little support has been found for this theory. Aho (1990), in his study of Idaho Christian Patriotism, did not find that members of that movement were more likely to have been socially detached. In fact, the key to joining the movement was having a friend or associate who was a member of the movement.
This theory is also subject to circular reasoning as it incorporates, at least in part, deprivation theory and relies upon it, and social/structural strain for the underlying motivation of social movement activism. However, social movement activism is, like in the case of deprivation theory, often the only indication that there was strain or deprivation.
Resource mobilization theory emphasizes the importance of resources in social movement development and success. Resources are understood here to include: knowledge, money, media, labor, solidarity, legitimacy, and internal and external support from power elite. The theory argues that social movements develop when individuals with grievances are able to mobilize sufficient resources to take action.The emphasis on resources offers an explanation why some discontented/deprived individuals are able to organize while others are not.
In contrast to earlier collective behavior perspectives on social movements--which emphasized the role of exceptional levels of deprivation, grievance, or social strain in motivating mass protest--Resource Mobilization perspectives hold "that there is always enough discontent in any society to supply the grass-roots support for a movement if the movement is effectively organized and has at its disposal the power and resources of some established elite group"  Movement emergence is contingent upon the aggregation of resources by social movement entrepreneurs and movement organizations, who use these resources to turn collective dissent in to political pressure. Members are recruited through networks; commitment is maintained by building a collective identity, and through interpersonal relationships.
Resource Mobilization Theory views social movement activity as "politics by other means": a rational and strategic effort by ordinary people to change society or politics. The form of the resources shapes the activities of the movement (e.g., access to a TV station will result in the extensive use TV media). Movements develop in contingent opportunity structures that influence their efforts to mobilize; and each movement's response to the opportunity structures depends on the movement's organization and resources
Critics of this theory argue that there is too much of an emphasis on resources, especially financial resources. Some movements are effective without an influx of money and are more dependent upon the movement members for time and labor (e.g., the civil rights movement in the U.S.).
Political process theory is similar to resource mobilization in many regards, but tends to emphasize a different component of social structure that is important for social movement development: political opportunities. Political process theory argues that there are three vital components for movement formation: insurgent consciousness, organizational strength, and political opportunities.
Insurgent consciousness refers back to the ideas of deprivation and grievances. The idea is that certain members of society feel like they are being mistreated or that somehow the system is unjust. The insurgent consciousness is the collective sense of injustice that movement members (or potential movement members) feel and serves as the motivation for movement organization.
Organizational strength falls inline with resource-mobilization theory, arguing that in order for a social movement to organize it must have strong leadership and sufficient resources.
Political opportunity refers to the receptivity or vulnerability of the existing political system to challenge. This vulnerability can be the result of any of the following (or a combination thereof):
One of the advantages of the political process theory is that it addresses the issue of timing or emergence of social movements. Some groups may have the insurgent consciousness and resources to mobilize, but because political opportunities are closed, they will not have any success. The theory, then, argues that all three of these components are important.
Critics of the political process theory and resource-mobilization theory point out that neither theory discusses movement culture to any great degree. This has presented culture theorists an opportunity to expound on the importance of culture.
One advance on the political process theory is the political mediation model, which outlines the way in which the political context facing movement actors intersects with the strategic choices that movements make. An additional strength of this model is that it can look at the outcomes of social movements not only in terms of success or failure but also in terms of consequences (whether intentional or unintentional, positive or negative) and in terms of collective benefits.
Reflecting the cultural turn in the social sciences and humanities more broadly, recent strains of social movement theory and research add to the largely structural concerns seen in the resource mobilization and political process theories by emphasizing the cultural and psychological aspects of social movement processes, such as collectively shared interpretations and beliefs, ideologies, values and other meanings about the world. In doing so, this general cultural approach also attempts to address the free-rider problem. One particularly successful take on some such cultural dimensions is manifested in the framing perspective on social movements.
While both resource mobilization theory and political process theory include, or at least accept, the idea that certain shared understandings of, for example, perceived unjust societal conditions must exist for mobilization to occur at all, this is not explicitly problematized within those approaches. The framing perspective has brought such shared understandings to the forefront of the attempt to understand movement creation and existence by, e.g., arguing that, in order for social movements to successfully mobilize individuals, they must develop an injustice frame. An injustice frame is a collection of ideas and symbols that illustrate both how significant the problem is as well as what the movement can do to alleviate it,
Important characteristics of the injustice frames include:
In emphasizing the injustice frame, culture theory also addresses the free-rider problem. The free-rider problem refers to the idea that people will not be motivated to participate in a social movement that will use up their personal resources (e.g., time, money, etc.) if they can still receive the benefits without participating. In other words, if person X knows that movement Y is working to improve environmental conditions in his neighborhood, he is presented with a choice: join or not join the movement. If he believes the movement will succeed without him, he can avoid participation in the movement, save his resources, and still reap the benefits - this is free-riding. A significant problem for social movement theory has been to explain why people join movements if they believe the movement can/will succeed without their contribution. Culture theory argues that, in conjunction with social networks being an important contact tool, the injustice frame will provide the motivation for people to contribute to the movement.
Framing processes includes three separate components:
For more than ten years, social movement groups have been using the Internet to accomplish organizational goals. It has been argued that the Internet helps to increase the speed, reach and effectiveness of social movement-related communication as well as mobilization efforts, and as a result, it has been suggested that the Internet has had a positive impact on the social movements in general.
Many discussions have been generated recently on the topic of social networking and the effect it may play on the formation and mobilization of social movement. For example, the emergence of the Coffee Party first appeared on the social networking site, Facebook. The party has continued to gather membership and support through that site and file sharing sites, such as Flickr. The 2009-2010 Iranian election protests also demonstrated how social networking sites are making the mobilization of large numbers of people quicker and easier. Iranians were able to organize and speak out against the election of Mahmoud Ahmadinejad by using sites such as Twitter and Facebook. This in turn prompted widespread government censorship of the web and social networking sites.
The sociological study of social movements is quite new. The traditional view of movements often perceived them as chaotic and disorganized, treating activism as a threat to the social order. The activism experienced in the 1960s and 1970s shuffled in a new world opinion about the subject. Models were now introduced to understand the organizational and structural powers embedded in social movements.