 Complete the following phrase:  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. 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 