This comes as Facebook is promoting its "Charting a Way Forward: Online Content Regulation" white paper, which offers guidelines for future regulations. Breton dismissed the guidelines proposed in Facebook's white paper as insufficient. He noted that Facebook didn't mention its own market dominance or clearly outline its responsibilities.

"It's not for us to adapt to this company, it's for this company to adapt to us," Breton told reporters after a meeting with Facebook CEO Mark Zuckerberg.

On Wednesday, Breton is expected to announce proposals to regulate US tech giants and state-aided Chinese companies, as well as proposals for governing artificial intelligence. Zuckerberg has called for regulation in the past, but Facebook's current recommendations propose, for example, giving tech companies flexibility to experiment with content moderation technology. Critics say the company isn't acting fast enough.

In a statement EU justice chief Vera Jourova said, "Facebook cannot push away all the responsibility. Facebook and Mr. Zuckerberg have to answer themselves a question 'who do they want to be' as a company and what values they want to promote."