Is anyone reading this active on one of these sites?

LibraryThing
GoodReads
Shelfari
LivingSocial
RedRoom
WeRead

I find that Child of Fire is already on Shelfari and I am already on LibraryThing under my short story name.

But are any of you folks active on these sites? If so, what do you like about it?

I’m allergic to the idea of joining a social networking site solely to promote my book (although I received this list of sites from a how-to-promote document from my publisher)–in fact, I’m tempted to drop my book cover as my default user icon on LiveJournal because I’m thinking it’s a little tacky. But I’m not averse to joining an interesting site.

What do you think?