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WordNet
social movement

n. a group of people with a common ideology who try together to achieve certain general goals; "he was a charter member of the movement"; "politicians have to respect a mass movement"; "he led the national liberation front" [syn: movement, front]

Wikipedia
Social movement

Social movements are a type of group action. 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.

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.