[hasenj]

That's not my point.

People join facebook because all their friends are on it, and they get to see a news feed.

It's not instantly familiar or usable, and no one knows what's a wall or a news feed, but when you find pictures of a friend you haven't seen in 10 years, you'll probably stick around and try to figure it out.

Of course, at the beginning the only users where college students and people in their teens or twenties. But now even people in their forties join just because they can keep in touch with their distant relatives and old friends.