Whether or not you even see specific content on Facebook, Google or Hacker News depends on sorting algorithms, so that would be one of the tools used to censor

Whether or not you even see specific content on Facebook, Google or Hacker News depends on sorting algorithms, so that would be one of the tools used to censor content. It's not just "the delete button", it's so much more, like how DMCA processes are handled or AIs created to find naked people (which affects artists).