sentences:  An online field experiment conducted on 61 million Facebook users tested whether receiving information about voting, polling places, and the voting behavior of one's friends led individuals to seek out political information, influenced political self-expression, and changed real-world voting behavior.Web-based experiments have particular salience in studies of how online communities operate.Internet studies, including studies of online communities and social networks, have used natural and field experiments to understand the effects of informal rewards in peer production on Wikipedia, as well as the impact of early recognition and support on future successes on Kickstarter, Change.org, Epinions, and Wikipedia.