fb privacy
I'm a software developer at ReputationDefender.com -- we offer a free product, no strings, for fb users called
Privacy Defender.
There are, at last count that I know of, about 129 privacy settings on fb -- this product allows you to clamp down all of them using an easy-to-understand interface.
Privacy on fb is no joke - keep things locked down to your friends...if you're exposed, then your friends are exposed...and vice-versa.
Now, speaking as a parent, 9 is too young. Just b/c all the other cool kids are doing it, don't make it right. (argh! I sound like my dad....
) There are plenty of other sites for social-networking that she can use. Unless you're going to supervise her on your account (which could also be a boon involving yourself in her world), then help her find alternatives, using the suggestions posted here.
My two cents - apologies if the shameless plug for what I believe is a good product offends anyone.
--mike