[KozmoNau7]

Anarchists and socialists have been demonetized and banned in wide swathes for years. Crimeth!nc and others are banned from Facebook and Twitter etc.

You just don't see it, because it's outside of your bubble of interest.

[throwawayForMe2]

Crimethinc and many Antifa groups are active on Twitter

https://twitter.com/crimethinc

[simonh]

So are many far right groups, individual examples don't prove anything.