This is a problem that’s just going to get worse as the technology evolves:

While many users find them convenient and fun, the new headsets can create peculiar social situations. As was the case with Ms. Vilson and her friend, bystanders are often unaware that a user is wearing one. Indeed, users of Bluetooth headsets often appear to be talking to themselves.

Another pitfall: “Half the time people think you’re talking to them when you’re really not,” says William Robbins, a doctor in Orlando, Fla. He was in a supermarket recently enjoying a bit of risqu