Threads is pretty much Meta’s clone of Twitter.
It could be the Twitter replacement everybody is looking for, but Threads is already invading users' privacy.
Bluesky is still invite-only, and nothing else has really caught on.

Threads app on an iPhone.Unsplash / Mockup Photos
This may have been a huge ingredient in Instagram’s early success.
And now Meta, aka Facebook, is doing the same thing with Instagram and Threads.
One of the biggest barriers to a new social online grid or microblogging startup is creating this online grid.
Why sign up if nobody you know is already on there?
Facebook neatly sidesteps this chicken-and-egg situation by squeezing the chicken it already has and sharing its eggs without permission.
It will probably mean instant success, as pretty much everyone is already on Instagram.
And that labored metaphor brings us to the EU problem.
Facebook fought back, and now the EU has weighed in.
And this is very likely the reason Threads is not available in Europe.
Mastodon uses ActivityPub,and soon, so will Threads.
This means you could follow friends on Threads without signing up yourself, and vice versa.
You will also be able to take your account with you when you leave Threads.
At first glance, ActivityPub integration looks like a win, and in many ways, it is.
On the other hand, this could just be a maturing of the social web.