According to the company, Circle is already available to a "small group" of Android, iOS, and web users throughout the world. It's unclear when or if Twitter will broaden the test to a larger audience, but it will most likely depend on responses.
Some Tweets are for everyone & others are just for people you’ve picked.— Twitter Safety (@TwitterSafety) May 3, 2022
We’re now testing Twitter Circle, which lets you add up to 150 people who can see your Tweets when you want to share with a smaller crowd.
Some of you can create your own Twitter Circle beginning today! pic.twitter.com/nLaTG8qctp