Here's a troubling story on The New Observer about Israel's "demanding" worldwide social media censorship by companies in all countries to stop terror propaganda against the country, link. The tone of the story contradicts the idea of downsteam liability limitation in US law with Section 230. The idea is likely to win the favor of Donald Trump.
The story was first circulated today on Facebook by sources in Hong Kong and Taiwan. Censorship has been creeping in Hong Kong, as we know from bookseller cases. The story is also getting attention on Twitter this weekend.
Social media companies insist they will remove terror propaganda and support when users bring it to their attention, where Twitter has been "abused" the most with "recruiting". But there is no systematic way to stop all of it.