Tech Opinion - What is the point of these "social networking" sites?

Date: 2007oct30 Q. What is the point of these "social networking" sites? A. Mutual Blogging. I think the best part is... it's a blog that people actually read. When I post stuff on my Facebook profile it is read by nearly all of my (Facebook) Friends. They sometimes comment - that is great. When I had a blog before it seemed that nobody read it. Of course, the downside is that I have to read their posts too :) Its this mutual blogging that's the best for me. I am sure it could be done with RSS and FOAF. I would love to get out of Facebook's walled garden.