From #13 and #14 of the user agreement/site rules-
13. Please preview your posts. Read them aloud to yourself, if possible (don't get fired if you're doing this at work). You can preview as many times as you like, but you only get to post it once.
14. Any messages you post in these discussion forums will remain available to the public for as long as this discussion board is online. Once you have posted your message, it will stay online. Please post carefully and with due consideration to the content of your post.