[LarryDarrell]

Yes, the mechanism is the same.

However, Facebook has lines that when crossed result in being moderated. Their moderation system is obviously imperfect and a lot of the time they act too late, but it's there.

Parler was courting all the line-crossers with the promise that there would be no such moderation on their platform. That ended with predictable results.

[WalterSear]

There was more moderation going on, on Parler, than anywhere else. Users would start out shadow-banned until the moderators approved of their groupthink.

It wasn't just calculated to bring out the worst: it was actively fostering it.