Is there a link between activity on social networks and activity in politics? According to Pew, yes:

The use of social media is becoming a feature of political and civic engagement for many Americans. Some 60% of American adults use either social networking sites like Facebook or Twitter and a new survey by the Pew Research Center’s Internet & American Life Project finds that 66% of those social media users—or 39% of all American adults—have done at least one of eight civic or political activities with social media.