Intersting idea but I'm not aware of it and make too many of my own apostrophe errors to count them.

What I've noticed over there is if not spotted (/commented on - I think at times some keep quiet), Lizzie will advertise her presence by making a series of posts, by adding lots of smilies to posts, by passing (eg. SOH) comments that only Lizzie can, etc. Sometimes she also makes remarks hinting at how long it will be before she is reported (not that I think the host can't spot it herself).