Earlier quoted context omitted.
A large amount of insurrection planning was performed in Facebook groups. If you're going to apply a standard, at least apply it fairly.
Those groups all got closed, so far as I know, many of them long before the 6th. Do you have specific one's you're worrying about? It's fair to argue that Facebook should have done more, or did the wrong thing, but they were pretty transparently trying to clean things up at least. Parler wasn't banned retroactively as punishment, they were banned because they were continuing to do no meaningful moderation even days a…
Step 1: Hire huge moderation team.
Step 2: Write draconian terms of service that incorporated every possible offensive thing that any vendor might object to.
Step 3: Build an app that explodes with all the users that are delighted with the moderation.
Step 4: Profit!
That's not how Facebook and Twitter ("the free speech wing of the free speech party") were launched, but maybe those wouldn't ever have been able to launch today anyway.