I don't get Facebook

Andrej recently posted on how young people are using social networks which really helps articulate some of my experience with them. I totally understand personal webpages, but we you start talking all these friends and friend invites, it just didn't make sense. I don't get the Wall idea. I can see what someone wrote on my friend's wall but I can't see their response. I may have the same question, does that mean they have to do the same for me? It is just confusing. Give me a bunch of close friends, real blogs with comments, and a tool to aggregate RSS and I am a happy camper.