Supreme Court Justice Clarence Thomas has suggested that Congress consider extending common carrier legislation to cover social media platforms. This would essentially prohibit social media companies from removing any legal content (perhaps including some forms of spam), but they would still be able to give users tools for filtering content that they see.

This would be a form of compelled speech, which does raise 1st Amendment concerns. But in principle it's no different from forcing telephone companies to carry all voice traffic without active censorship.

https://www.npr.org/2021/04/05/984440891/justice-clarence-th...