Instead on censoring speech why not provide tools that lead to better speech? This is perfectly possible from a tech stand point but companies would rather have the power that comes from censorship.

1. Get rid of anonymity/pseudonymity. Free speech is a right. Anonymity is not. If people had to post everything in their real name you would get rid of all of the fake b.s. and people would be much more civilized in their speech.

2. Provide content filtering tools based on user voting with a public record of user votes and the option for people to turn off the filters so that they can see what is filtered.

With these 2 mechanisms you can create a public square with absolute free speech where hate speech is filtered and suppressed, if people choose that, but the records are clear and people who want to audit the filtering can do so as they please.