Freedom of speech is NOT about being allowed to incite insurrection against the United States Government. These sites are private businesses, as I said before, they have EVERY right to ban posts or remove users from their sites.
This is NOT my opinion, this is what numerous Experts on Constitutional law and Constitutional lawyers have stated: this misinformation reveals the ignorance of the general populace about what the Constitution guarantees and what the Constitution really means. Much of this ignorance is due to the fact that schools don't teach Civics anymore.
Ignorance is NOT an excuse for misinterpretation.