11. Tesco
Not every Tesco account can be as good as the Tesco Mobile team, who delight in responding to customers with criticisms of their product and service with pithy, delighted comments. The company was rocked badly by the horse meat crisis, which revealed that a horrible number of processed meals in supermarkets in the UK contained meat that wasn't actually supposed to be in there. Despite eating donner kebabs as a staple of weekend cuisine (which probably contains a lot worse than horse meat, which is perfectly edible,) the nation - and indeed the rest of Europe - was outraged by the appearance of horse in their food chain, and the lack of appropriate labelling. Tesco's Twitter account meanwhile either spectacularly failed to grasp the seriousness of the situation with their horsey pun (which probably became the 8th billion jokes along the same lines to appear on Twitter in those dark days) or they genuinely didn't realise their unfortunate turn of phrase would be taken as it was. Given the irreverent brilliance of the Tesco Mobile account, you have to suspect it was intentional. Perhaps not smart, but still intended.