Worried that someone's relationship status has just changed on Facebook and you're in the middle of nowhere and won't find out until 6.35pm at best? Concerned that someone's just Twittered about an update to their Flickr page which contains a photo of you taken at 2.25am last Saturday, but you're eight miles from the nearest wi-fi point? You are not alone. 27% of Britons apparently suffer from "stress" when not able to go online. This leads to a feeling of uselessness...