Do you write under a pseudonym? That may offer at little protection, at least. Then there are the Facebook "pages" that people can "like." I don't know if those have to be connected to a personal Facebook profile or if they can just be created for something specific while the creator's personal stuff remains private.

I don't really know. I loathe Facebook and actually haven't thought too much about marketing yet when it comes to my writing. I have so many other social networking platforms I use--LJ/DW, Twitter, Tumblr, Google+ (though that would likely carry the same privacy issues as Facebook)--that I figured that would cover things pretty well. But you're right; Facebook probably is the most popular of them all, especially among people who don't "do" social networking or Internet stuff as much as some, like grandparents.