Honourable Mention
Paris Hilton
Remember when the socialite, heiress and terrible actress got all confused at the death of Nelson Mandela? So does half the world, but as she has pointed out with great fury since then, she actually did nothing of the sort. The offending Tweet above was the creation of Twitter hoaxers, but that didn't stop everyone, including news outlets, falling over themselves to proclaim her an idiot. Shame on them. Unfortunately for Miss Hilton, some muck sticks, and she's been forced to come out with an official rebuttal via her real account, which will no doubt completely pass by a still considerable portion of commenters who will invariably cherish every morsel that destroys the image of their idols over the actual truth. But, hey, at least she didn't use an unfortunate turn of phrase to "commemorate" Mandela's death, like sometimes Arsenal midfield star Jack Wilshere did...
Wait... he deserved it?