Advocacy groups, also known as special interest groups, use various forms of advocacy in order to influence public opinion and ultimately policy. They play an important role in the development of political and social systems. Motives for action may be based on political, religious, moral, or commercial positions. Groups use varied methods to try to achieve their aims including lobbying, media campaigns, publicity stunts, polls, research, and policy briefings. Some groups are supported or backed by powerful business or political interests and exert considerable influence on the political process, while others have few or no such resources. Some have developed into important social, political institutions or social movements. Some powerful advocacy groups have been accused of manipulating the democratic system for narrow commercial gain and in some instances have been found guilty of corruption, fraud, bribery, and other serious crimes; lobbying has become increasingly regulated as a result citation needed. Some groups, generally ones with less financial resources, may use direct action and civil disobedience and in some cases are accused of being a threat to the social order or 'domestic extremists'. Research is beginning to explore how advocacy groups use social media to facilitate civic engagement and collective action.