This story just keeps getting better. This is from the Wall Street Journal.
Since its creation in 2007, Facebook’s Data Science group has run more than 1,000 tests. One published study deconstructed how families communicate, another delved into the causes of loneliness. One test looked at how social behaviors spread through networks. In 2010, the group measured how “political mobilization messages” sent to 61 million people caused people in social networks to vote in the 2010 congressional elections.