Facebook and these other companies have defended themselves in lawsuits when somebody post child pronography or something that may have contributed to violence by using the argument they are only a platform that cannot control what others post or share, that they are not content creators. These actions totally void these claims that they are only a platform. If there is an honest trial with all the facts coming out, they are screwed.
Start with a $250 million lawsuit to get their attention.
Then go UP from there.