Presencee is a social networking service that lets people keep their fellow passengers and commuters updated about their travelling schedule. This, according to the service’s founder, would help people connect with others for personal and professional reasons. The app has four internal service engines: flights, trains, events, and people. Each of these categories comprise people who have used Presencee before to mark their presence. People share their Facebook, Twitter, and LinkedIn profiles so that other attendees could reach them.