We would also ask that users do not try to circumvent this by editing their own posts to delete the content, for essentially the same reasons.
Obviously, all this is subject to common sense! If you post something that you later decide is ill-considered, or accidentally post personal information, or any one of several reasons, you can edit your posts (if appropriate, leaving an "edited to..." remark). If you're not sure, please PM a mod for guidance.
This seems to still be happening with growing frequency. Just to let you know that we are deciding on the best way to approach this, which could include reinstatement of posts from the Moderators' log or some kind of sanction for frequent naughty people.