I know it is common for users to leave a thank you note after a namechange One of them just thanked me on WP CHU after I carried out his That s not what I meant That post was not ident properly theoretically if he had forgotten to log in or had been logged off forcibly while editing we would have seen something like thank you but instead there was just the thank you part with no signature of any kind which was not consistent with the registered user s behavior since as I said he had used tildes every time It all pointed to a simple anon test As far as why at WP CHU or why say thank you of all things well it could have been in the spirit of the can I really edit this kind of test Of course none of this precludes peremptorily the possibility that it could have been indeed the user logged off If it was than it was an honest mistake distraction on his part which entailed an honest mistake from me As that edit stood there was no reason to assume that it was a legitimate contribution although as I said nor was it really necessary to have removed it in the first place since it was really doing no harm