Fun Fact from Tommy: While we may be able to count 5,000 friends on Facebook, scientists have shown that humans' brains are capable of managing a maximum of just 150 friendships. No matter how sociable you think you are, the neocortex, limits us to managing 150 friends. So that's why you forgot who that was, and where you didn't know them from. You're not a jerk or conceeded. It's your brain's limited hard-drive space.