Be HONEST, do people judge others on the amount of facebook friends they have?

[Tatty]

Yes.
Unless they have people who they really don't know, I would say 500+ friends as just sociable. For example, I have three-hundred-and-something friends, a lot of them I wouldn't make the effort to talk to, but I talk to a fair amount of them. I add people and people add me if we've just met, and I've also become closer to people through facebook. Someone I saw today, a friend of a friend, has 800 friends. I think they're a popular person, and I would say, a fair amount of them, they probably do know.
Having people on your friends list is increased even more if you go to school/college, because you'll have a lot of acquaintances on there as well.

But on the other hand, a close friend doesn't have Facebook at all, and is one of the most popular people I know.
If someone has 45 friends, I probably would judge them as unpopular, yes. But I wouldn't hate them for it, or anything! Maybe they'd just joined.