I am quite proud of the fact I only have 100 FB friends, because I know each and every one of them. I lot of people I know from IRC and work refer to me as the Facebook Nazi because I won't add them, but they're not really my friends and I don't want to know what they're doing at 5am in the morning.
Toughen up a bit, delete those people you added because you know a tiny bit about them and things'll become that much easier to deal with.
This is exactly like the "Oh I get SO MUCH email" posts and then you find out the person signed themselves up to 50 email lists, 20 "email me when you get a new comment/status" things etc. Don't sign up for crap you don't want, it's that simple!
[Edit was just spelling fixes]