After the public beta at the beginning of this month, twitter announced that the twitter circle function was officially open to all users around the world. This function is similar to the close friends function on instagram. It can share tweets with their 150 closest friends.
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The twitter circle feature allows users to create specific user groups and share tweets with them. In essence, this will allow Twitter users to share some tweets with a predefined group of users without making the tweet public.
After testing this feature for about a month, twitter decided to promote it to more users around the world. If you are one of the selected people, you will see a pop-up window immediately when you open twitter on the network or mobile phone.