You have the right to remain silent.
Anything you type or say will be recorded.
Anything you type or say will be used to manipulate you and may be used against you, not only in a court of law, but also in a myriad of ways you cannot even imagine.
You may be able to delete posts but eradication is difficult if not impossible (http://mashable.com/2014/07/02/how-delete-facebook/#T.8t7Eg6GOqA).
You have the right, nay even the responsibility, to think before typing or saying anything.