Yet Another Social Networking Site

I'm of two minds, give or take a mind, about goodreads.com. It appears to be a kind of facebook for people who can actually remember what a book looks like, or claim to.  Our shamelessly self-aggrandizing acquaintance had it recommended to him by some blog postings as a way of promoting his silly book, and so he's given it a try, kicking and screaming all the way.  If this goes on, can a Facebook presence be far behind?

One or two of you, I believe, are actually on goodreads; what do you think of it?  Mr. McConnell tells us that he's reluctant to spend a lot of time on it, but is willing to if it's not a complete waste.