On Facebook, you may be a guinea pig and not know it. Facebook is the best human research lab ever. There’s no need to get experiment participants to sign pesky consent forms as they’ve already agreed to the site’s data use policy. A team of Facebook data scientists are constantly coming up with new ways to study human behavior through the social network. When the team releases papers about what it’s learned from us, we often learn surprising things about Facebook — such as the fact that it can keep