A British man is appealing for the third time against his conviction over a 'joke' posted on Twitter.<br /><br />Paul Chambers tweeted he would blow up a local airport - closed because of bad weather - so he could fly to see his partner in Ireland.<br /><br />Web users, including some celebrities, have supported the man saying his case is raising questions of internet freedom in the UK.<br />Al Jazeera's Laurence Lee reports from London.
