Ah, Facebook. Everyone uses it. And everyone uses it differently.
Here’s how I use it: to promote my gift blog, Find A Toad. I have a modest (but growing) number of fans, and I get decent feedback, way more than I received just by my mere existence on the blogosphere. I often use it as what I term “shameless self promotion” for my other writing projects. I also use it to keep in touch with all sorts of friends and acquaintances from past and present.