Twitter's online speech norms were created and shaped by lawyers who were deeply knowledgeable of existing First Amendment case law in the U.S. It feels like journalists now want platforms to intentionally deviate from that: https://harvardlawreview.org/wp-content/uploads/2018/04/1598-1670_Online.pdf … https://twitter.com/TonyRomm/status/1029827909987520512 …
Good design is a huge component of this, but also a lot of these issues have to do with non-transparent hypertargeting of political messages, fringes buying into violent conspiracy theories, etc.