Congressman Schiff sent Facebook a letter about anti-vaxxing information being promoted FB. FB has already begun deleting users posts.
https://www.usatoday.com/story/tech/news/2019/02/21/pinterest-blocks-vaccination-searches-halt-anti-vaxx-misinformation-spread/2938629002/
https://arstechnica.com/science/2019/02/facebook-working-on-additional-changes-to-beat-down-anti-vaxxers/
https://healthscamsexposed.com/2019/02/facebook-set-to-ban-all-posts-questioning-vaccines/
This is not about the topic being deleted but about should the gov control social media.