Twitter’s feature for tweeting only to close friends is now available to all its users. After nearly four months of testing, Twitter Circle is rolling out for everyone to help people feel “more comfortable tweeting and expressing themselves.”Twitter Circle is a bit like Instagram’s “close friends” feature.. Meant to be a sort of middle-ground between a public and private account, users can designate some tweets to be viewable only to a smaller “circle” of up to 150 followers. The feature could help address a long-running issue for the company: that many Twitter users simply don’t feel comfortable tweeting that much, either for fear of harassment or simply the pressures associated with public-facing accounts.Interestingly, Twitter says that its early tests of the feature have shown that users with Circle tweet more overall, and get more likes and replies when tweeting to a smaller group. The company notes that it also reduces the need for users to have a se