You may or may not have noticed, but when you look at your profile on Facebook in the Friends section on the left, there are 9 friends who occupy those boxes. Well, they aren't there by accident, Facebook has an algorithm that chooses who shows up in those boxes. Some people thought it was who was creeping in your posts the most, but it's actually based on 12 factors: profile views, tagged photos, wall posts, likes, comments, viewed photos, private messages, mutual interactions, friends who are currently online, friends you've added to the "close friends" group and group chats. So, while who you look at and who looks at your helps determine who's in the boxes, it's a little bit more than just that. So if you want to see your crush pop up in one of those choice spots on your profile, get creeping, uh no, interacting more!