By Kevin MayMany passengers have their heads buried in a device or laptop as they wander around or wait at an airport.Frequently they are browsing or updating their social media channels – but is it to rant about delays, show off that they are heading away somewhere or just adding to the general noise of Twitter, Facebook et al?Geofeedia analysed hundreds of thousands of tweets and updates to establish what people are doing on those social channels at four major airports in the US (Los Angeles LAX, New York JFK, Dallas-Fort Worth and Chicago O’Hare).Here is an infographic with some of the those answers.