What exactly is behind this whole social networking craze?

I created a YUWIE profile because it pays you to do things like that. They give you the opportunity to share their income earned from advertisements.





Here's my profile:


http://www.yuwie.com/trinale





To find out how the whole pay thing works:


http://www.yuwie.com/yuwie.asp?r=6120





As for the other sites. I have no idea what the craze is. It seems like it's just a contest to see who can get the most friends.