Harvard neuroscience researchers have just confirmed what many of us have suspected all along: social networks like Facebook, Twitter, Instagram and Pinterest are “brain candy” for Internet users. Every status update, every tweet, every pin is a micro-jolt delivered squarely to the pleasure centers of our brains. We get approximately the same type of pleasure from talking about ourselves on social media as we do from having sex. As Facebook bulks up to take on new challengers after its much-anticipated IPO next week, is it possible that the battle for future dominance on the Internet will actually take place inside our heads?