What type of idiot puts sensitive personal info on there anyway?
Dont put your phone number, home address, SS number, bank account info, or anything else like that out there and this will never be an issue. No identity thief is interested in your score on Farmville, or your likes.
You provide PI when registering for third-party apps on FB.
Facebook is a communications vehicle, and, whether you want to be on it or not, you might have to if you want to see pics of your grandchildren, send notes to your friends, etc.
So, for example, if your college student child uses FB more often than email, you might have to use FB to communicate.
Facebook is becoming the sole or primary web presence of many businesses and activities. The concert announcement and information for your local symphony orchestra might be made only on Facebook.
Like it or not.