The best thing about facebook, other than the fact that it has achieved coveted verb status, is that this medium gives you a opportunity to get a portrait of a person through one little neat profile.
As a writer, I think it would be great fun to use facebook for character development. After all, I've heard of fake twitter accounts posing as characters, why not get some literary advantage out of social media?
For example, I'm going to profile one of my characters below, to illustrate the idea.
Name: Tim Blackmore
Work and Education
Employers: None, and there probably will never be any with rate his villain studies are going. I'll be lucky to make henchman
School: Grimwood Academy for Villains
Political Views: I follow in my father's footsteps and proclaim anarchy and monarchy to be the only two true political policies available
Favorite Quotations: The optimist proclaims that we live in the best of all possible worlds. The pessimist fears this is true. -James Branch Cabell
Arts and Entertainment
Music: I enjoy records when my gramophone doesn't conspire to eat them
Books: Sigh... I don't read much but textbooks, "The 13 Classic Evil Plots" or "Basic Evil Gadgets, and How to Use Them To Take Over the World"
Movies: Movies are for commoners without ambitions to take over the world. Or that's what my father says anyways.
Activities and Interests
Activities: Eradicating my Mutation Science Lab Grade... and not on purpose
Interests: Not Failing
About You: Will I ever be evil enough?
Relationship Status: Disappointing son of an evil villain
What would your character's profile look like? What would they tweet?