I have worked in one of those so called social networks. Yes Google, Facebook,Twitter in the heard of Silicon Valley the majority are liberal companies. Hard to talk about religion, 2A, traditional family values without being treated as a racist or a Trump supporter... There is a case against Google (YouTube division) from PragerU which claims yes you can't be a public forum and restrict people's opinions, you can't have it both ways. In a nutshell, private companies are that and should be regulated if they control the narrative (politics)