these people with like 6000 friends are either pornstars, actors, musicians, or simply social butterflies.
I myself have like 670 facebook friends, a quarter (maybe a lil more) are people I'm actually close friends with, the rest are acquaintances, musicians I like and follow touring dates of, or people I've met on the internet and havven't met yet.
I mostly just use facebook for networking, and chatting to people miles away for free, keeping up rapport so I can visit them up the country or in foreign lands.
Some of those "not-particularly social" dudes you're chatting about just add loadsa people on facebook to make themselves feel popular by looking at their friends count, from my experience.
It sounds like you're taking things way too seriously - maybe your 132 facebook friends are simply all people you see a lot, do you add people you don't know much often??
Lighten up - it's fucking FACEBOOK - it's far from reality.