I use FB to promote my writing; that's all I mention on my status updates, and most of my friends are other authors. There are no pix of me there, just cover art. I'm not even "friends" with my husband. :P I do have a fan page as well. But FB is a tool to me, and as Stitchawl said, we should use tools, not the other way around. I've cleared out my info as much as possible, since it's not really relevant to my writing anyway.
Also, FWIW, I ran across this post on
how to permanently delete your FB account a few days ago. In case anyone's actually going to go that route, here's apparently how it works.