Even X - previously known as Twitter - is now threatened by measures from the EU Commission.
Billion fines may be the result.
According to the Commission, initial investigations show that the online giant does not meet the requirements of the EU's Digital Services Act, DSA, in three important areas.
The system of "verified users" is criticized for being misleading, sufficient transparency about advertisements is lacking, and X does not provide researchers with access to data in the way that DSA requires.
A response is now awaited from X - although the Commission warns that it is ready to strike hard.
"X now has the right to defend itself, but if our opinion is confirmed, we will impose fines and demand extensive changes", warns Internal Market Commissioner Thierry Breton in a press release.
The EU's new tough network laws, DSA and DMA, came into full force during the winter and spring and entail strict new rules for the largest online giants. X risks, among other things, fines of up to six percent of the company's global turnover.
Formal investigations have previously also been initiated against, among others, Tiktok and Meta.
