I don't really friend many people anymore unless they request to be added first... but when I first got facebook (aka back in the day when it was just for college students and didn't have the billions of annoying add-ons, where basically the only thing you could do was poke people and join groups... those were the days) I tried to add... pretty much anyone from my college, and anyone from my high school, haha. I was just excited about the novelty of it and I used to have a contest with my cousin to see who could get more friends.