It all depends on the security settings you have as a user.... If you have it like many of us here, that means that only your friends can see your information... And off course most of us don't have any personal info in there, just likes and dislikes....
Study: Facebook users are easy targets for identity theft Facebook users give out personal information too readily By Ellen Messmer, Network World, 08/14/07
Users of the Facebook social-networking site are too gullible in giving up personal information, which could make them the targets of identity theft, according to Sophos research.