the thing about facebook is that because a lot of your information becomes public amongst your friends, some people go on adding frenzies to either have a peep at your photos, see who you're friends with, and to generally spy on who is speaking to you, and who you're speaking to.
other people go on adding frenzies to bump up their friends count to make themselves look popular. this girl i used to go to school with once added me. i thought id be nice and do the whole "hey, whats up, how you been these past few years?". in response i get "good, and you?"
i didnt reply. i deleted her straight away. clearly she really didnt give a fuck (though neither did i to be honest), and i was just wondering why the bitch added me in the first place. then i have others adding me who i either met once, or know through someone else (but very vaguely).