Ex FB engineer: "Facebook ran 100s of behavioral experiments on users, political, emotional, there a

CalmOceans

http://online.wsj.com/articles/facebook-experiments-had-few-limits-1404344378

"There's no review process, per se," said Andrew Ledvina, a Facebook data scientist from February 2012 to July 2013.

"Anyone on that team could run a test, They're always trying to alter peoples' behavior."

Tests were run so often, he said, that some data scientists worried that the same users, who were anonymous, might be used in more than one experiment, tainting the results.

Since its creation in 2007, Facebook's Data Science group has run hundreds of 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.