You can see I'm working on the code of the site :), I've just installed a powerful tool for administrator that logs the ip of the visitors of the site and automatically show if an users use multiple usernames. It also tracks if one is using a proxy server so that the admin can add the proxy's ip to a black list. Now a thing like "the borg group" is very difficult to remain unnoticed for a long time here... I hope that all this work of prevention will be useless and to find only friendly people in the future...