i use arsebook but again i have mine set pretty tight and i only add people i know, but being honest even when i see someones name suggested to me (that i know) to add as friends i don't automatically add them. i have about 90 people on mine, most are good friends, the rest i keep in touch with from places i have been on holiday in places like NZ and the alps, it's good to keep in touch with those people as i go back to those places so it's good to see them again.
some of my friends have over 400 friends, why? you don't actually know them!! they're just random people you meet!! :roll:
i also click "hide" on any of that mafia farmville vampire crap.
oh and as far as old school friends . . . i hated that school and the kids were all poorly educated idiots who i did my best to forget as soon as i hit summer holidays after my last year, when they add me now which several have done they get the ignore button toute suite!! usually takes them 2 refusals to get it though!!