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Threads is making moves for Mastodon integration
(www.threads.net)
A community to talk about the Fediverse and all it's related services using ActivityPub (Mastodon, Lemmy, KBin, etc).
If you wanted to get help with moderating your own community then head over to !moderators@lemmy.world!
Learn more at these websites: Join The Fediverse Wiki, Fediverse.info, Wikipedia Page, The Federation Info (Stats), FediDB (Stats), Sub Rehab (Reddit Migration), Search Lemmy
They can pull it - most users in Threads will be interacting with other Threads users and content. Mastodon will be simply "that ideologically weird corner", and in practice they won't miss it.
For scale: Threads currently has 100M users. The Fediverse as a whole has 1.5M.
And I think that will go both ways. I mean, we all already have the option of joining threads right now to interact with those 100M users but I have a feeling most that are here aren't.
Their joining the fediverse will be more disruptive than their leaving it I think. And that's not even considering the higher costs to anyone running instances, since all that extra volume won't be processed and stored for free (though admittedly I am not familiar with the implementation details of how federated content is handled).
Eternal September-like? It's possible.
13+ million total users: https://fediverse.observer/stats
I'm counting only monthly active users, for both sides. FediDB lists 1.2M for the Fediverse, your link lists 1.7M of them.