networking socially

I would consider myself, maybe not a computer nerd, but good with technology, for the most part. I've done my own hardware upgrades. I own lots of gadgets (including an ereader). I've designed websites. I'm a Mac user, although I don't know if that says anything about me besides that Steve Jobs owns a tiny piece of my soul.

But trendy things? I think I'm, like, six months behind whatever the new trend is online. But I'm told that the key to marketing one's book is social networking, so I've b...