This will probably be my last post about bluejacking, this site is starting to look a bit over-focused on the topic.

Over the last week, my girlfriend (who works at a large local school - 2,000 or so pupils) has been wandering around the school with a Bluetooth phone set to discoverable, and named after her. I couldn't think of a more tempting target for a bluejacker than a member of staff. She didn't receive a single message in this time.

However, on the train home from London one evening I was bluejacked; my Powerbook is called Susan (don't ask) and "Bertie" asked me how I was. "Bertie" then stopped receiving responses. We were in transit at the time, but I looked around and couldn't see anyone who looked younger than twentysomething.

My conclusion from this entirely unscientific and anecdotal study? Bluejacking is the province of students and young professionals, not teenagers. It's not a widespread activity by any means: captive audiences on trains provide a distraction for bluejackers. It's not a means of communication, as such: I have yet to hear of a 2-way conversation been carried out over the medium. As such it poses little threat to SMS revenues.