https://www.cnet.com/news/facebook-in-violation-of-new-cybersecurity-law-says-vietnam/

Such posts include those containing "slanderous content," "anti-government sentiment" and the defamation of individuals and organisations, it added, citing the Ministry of Information and Communications.

Despite repeated emails, Facebook did not remove the offending content and refused to hand over information on "fraudulent accounts" to the authorities, the ministry alleged.