As for them:
Twitter and Facebook candidly play political favorites. They censor ideas and content on the right while permitting countervailing ideas and thought on the left
Events of last week compared to events of last summer drive this home. Social media has been clamping down on complaints about a stolen election, to the point now that Facebook says it will censor all references to “Stop the Steal.”
Meanwhile, Twitter has altogether banned the President of the United States from its platform. Their justification for this is that his tweets threaten our country.
In contrast, neither Twitter nor Facebook banned Antifa or Black Lives Matter last summer when they were actively advocating the overthrow of the government. They chanted “No USA at all” and “Burn it Down” as they attempted to do precisely that. They failed, so far, but they did kill and maim a number of people and destroy billions of dollars in property.