Deleting posts should be an option. Much cleaner and easier than manually deleting the text (especially on mobile) and typing NM.
Are you planning to run for office or are you feeling guilty about all those bad things you said about LeBron now that he's signed with the Lakers?
If someone was digging for dirt on me, I have far too many skeletons to run for office without factoring this place in. Hell, the stuff on here would make me look good compared to my 20s.