I only have 76, so now I feel like a loser.
I've turned down a few people I didn't know or people I didn't like in the past. I've gotten a couple of friend requests from people who went to the same high school as me but graduated 10 or more years later. I suspect we share a mutual friend and I was "recommended" to them by the system, but screw that -- if I don't know you, I won't add you.
This guy who was a dick in high school sent me a request last week. No thanks. I don't accept requests from 1) jerks or 2) friend collectors.