Things like that do happen, but haven't seen it here. I checked your MaryKa post history, there hadn't been much recent activity. (Last posts were about a month ago) Sometimes entire threads are moderated out/off a board and we would certainly could have missed something like that. BTW, that's the reason for the limited amount of time posts can be edited, is to leave a record so someone can't be flamed and then the message is deleted.
When things like this do happen on other boards I'm on, it sadly usually turns out to be "my little brother" or someone else had access to account information is pretty much always on the other side of the computer and not a random internet attack. Not to say they don't happen.
But anyway -- here you are! Grats for that