Of maybe a couple hundred people I know, that have Facebook accounts, I've only accepted a few as "friends" there. You still have the option of blocking strangers from seeing your info and you can choose your friends there. I don't think any of my old "enemies" would be interested in sending me any friend requests anyway.
Can't say that it's a useful site in any way, besides for finding old friends, but it's okay if you have time to waste.
