You can add up to 150 users to your Circle, regardless of whether they follow you. Users in your Circle will see a note at the bottom of Circle-only tweets (and vice versa) that says, “Only people in @[yourusernameTwitter ]’s Circle can see this tweet.” Tweeting to your Circle is similar to having a private account, except that it only limits access to specific tweets rather than your entire profile.
People in your Circle will be unable to retweet anything you post there, but they will be able to screenshot and download your tweets. It’s also important to remember that Twitter’s community guidelines apply even if you’re tweeting to a smaller audience.
