It isn’t usually associated with the digital world, but the United Kingdom Independence party is proving itself to be pretty social-media-savvy. A YouTube video of its calypso song has been shared widely online, with Nigel Farage tweeting supporters yesterday to buy the track and make it No 1 in the singles chart. #Ukipcalypso trended on Twitter on Monday as a result. The party is currently polling at 15% but has disproportionately high levels of social media engagement for the size of its membership.