[newacct583]

> but aren't many violent acts planned on Facebook and Twitter?

Shouldn't anyone who plans a violent act on Facebook or Twitter (or Reddit, or HN, or wherever) be banned?

Note that both of those sites are ALSO in the process of desperately cleaning up their violent sub-communities. There's a somewhat humorous running gag right now of conservative thought leaders suddenly complaining that their follower counts are going down.

And as far as Parler specifically: it didn't "suddently get popular" in a vacuum. Parler absolutely was functioning as a kind of "ban evasion mechanism for Twitter". People who got tossed from Twitter (generally, yes, for violent rhetoric) would find a home there, and bring there followers. There was very little organic growth, it was effectively all cannibalized from Twitter.