Informational message group was shown the message, the button, a counter of how many facebook friends had voted but no profile pictures . 

- Informational message group 

The social message group was shown a statement on top of their news feed. This statement encouraged the user to vote, displayed profile pictures of mutual friends who claimed to vote, an 'I voted' button and information regarding polling places. 

Arizona State University

61 million facebook users were randomly assigned to either a 'social group' , an 'information group', or a 'control group'. 

Methods of testing hypothesis in A 61-million - person experiment in social influence and political mobilization 

A study to test the hypothesis that online social network can influence political behaviour. 

A 61- million- person experiment in social influence and political mobilization 

Groups utilized in '61-million -person study'
- Social message group 

- Social messaging group was shown to have exponentially higher rates of voter turnout among themselves and among others who were connected to them (ex: close friends)

- informational message group was shown to have higher rates of voter turnout than the control group but not as much as the social messaging group.

-The control group did not show any significant changes in voter turnout 

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