It's best to consider posting something before actually posting it.
Even if you delete your posts, they are still available and archived on the internet. Hopefully you haven't posted anything you will regret. Anything you post is still available online.
It's unfortunate so many children (and adults) don't understand this simple fact when they post their life stories on Facebook and Twitter to all of their "friends".
What Crystal said, and also.. I've seen posts which have said that if you dont want to be bothered by your TMF account, change your password to something random, log out, and you shouldnt be bothered by it again.