I have a 10 year old and I don't allow her to have her own FB account (I don't have one either). But she has friends who are already active in FB (Some couples should have used a condom until they are ready to be parents). As a middle ground, I allow her to connect with her friends on her mother's account.
Alas, a lot of kids think I'm too strict a parent. What they don't know is I only seem strict because they have parents who doesn't have the right to be.
Hey, a previous comment gave me an idea. Maybe I should report her classmates as underage to FB? It's gonna be sweet revenge! :P