I made a topic once on this very subject, I'll repost what I said there.

There needs to be a law against private censor. Often times when taking issue with the censorship tactics that social media platforms and activists use, they'll say that the First Amendment only protects you from government censor. Very true. But the First Amendment is not "The Freedom of Speech", rather it is a law based upon the principles of free speech. In the age of our founders, free speech was under threat by the government. In our age free speech is under threat by a public infected with a self-destructive savior complex, fueled with righteous indignation and a belief that there are no bad tactics, only bad targets. In an age where the public gets the majority of it's information from online sources and social media, free enterprise must take a back seat to the protection of a fundamental principle of the West: That people have a right to both say what they wish and listen to who they wish, without fear of unreasonable censor or consequence. Social media giants like Facebook, Twitter, and Reddit should not be allowed to censor their users, regardless what they say. If someone is making threats, take it to the police. But far too often the accusation of "dangerous speech" has been used to stifle political dissent. It's no secret that Progressive politics is the culture that dominates the makeup of these businesses, so it should come as no surprise that liberal and conservative voices are being silenced. If you run a small private forum or website, censor what you like. But when your business grows so large, with so much sway and influence over the public, there must be rules in place. These websites have a capacity to propagandise and marginalize on a level that would bring Joseph Goebbels to tears of joy. This must happen, for the security of our democracy and our principles. A democracy cannot function without an informed public, free of fear to voice their opinions, and confident that their voice will be heard and matters. We are a country founded upon Western enlightment ideals, the greatest principles in the world today. We must protect them from the cabal that would see them undone.

These social media giants are a propagandists wet dream. They must not be allowed to conduct themselves in a biased or censorious manner. When a site like Twitter or Facebook has grown so large, with so much influence, they have a moral obligation to ensure every voice is protected. That moral obligation should be extended into the form of law.