One of the largest TT Facebook groups with more than 300,000 members says it may close because of scammers.
Isle of Man Roadracing, which has been running for 11 years, says it's been repeatedly targeted by fake TT groups which aim to sell merchandising by stealing its content and cloning people's profiles.
The group's admins say they report the fakes but the social media platform has refused to take action.
Organisers say the situation is now so bad they may be forced to close down the original group, and are asking members to block the scammers to help combat the problem.