You’ve probably heard of extreme cases in which people treat bots as lovers, therapists or friends. But many more have them intervene in their social lives in subtler ways. On dating apps, people are leaning on A.I. to help them seem more educated or confident; one app, Hinge, reports that many younger users “vibe check” messages with A.I. before sending them. (Young men, especially, lean on it to help them initiate conversations.)