"I think someone is a multi-accounter
Double-check and try and get lots of good reasons for your suspicion, then talk to the 'multi-accounter'. If you're still sure then e-mail your evidence to
[email protected].
Lots more people are accused of being multi-accounters than actually are multi-accounters. It's actually very rare, so please make sure you have good reasons for accusing someone of multi-accounting before you do."
The above is out of the webDip FAQ, which can be found under the Help link at the top right of your screen.
http://www.webdiplomacy.net/faq.php#faq38