Elon Musk's X has blocked the European Commission from making adverts on its platform - a move which comes a few days after it fined the site €120 million (£105 million) over its blue tick badges.
Nikita Bier, a senior figure at the social media site, accused the European Union (EU) regulator of trying to take advantage of an exploit in its advertising system to promote its post about the fine on Friday.
It seems you believe that the rules should not apply to your account, he stated. Your ad account has been terminated. A European Commission spokesperson told BBC News that the Commission always uses all social media platforms in good faith.
The fine issued to X was the first under the EU's Digital Services Act. The EU regulator described the blue tick system as deceptive and claimed that it was not meaningfully verifying users, which exposed them to scams and impersonation frauds.
The platform has 60 days to respond to the Commission regarding its blue verification concerns or face additional penalties. Following the fine, Elon Musk expressed that the EU should be abolished via a post on X, which stirred further controversy.
This dispute began when Mr Bier accused the Commission of exploiting a rarely used account to deceive users into thinking a misleading post was a video to artificially boost its visibility. The EU responded by stating they were using the platform's tools as any corporate account would and expected adherence to the platform's terms.
