10. JP Morgan
Everyone hates bankers these days, to the extent that it appears they may have overtaken politicians as the most hated group of over-paid people who attract the open venom of the normal everyday working man. Not all bankers however appear to be aware of their public image, and expect open invitations to engage on social media to be wonderful exchanges of good will and enlightened debate. JP Morgan clearly fall into the latter category, having set up a live Twitter Q&A with Vice Chairman Jimmy Lee, where everyone could have their say to the supremo.
Sadly for the brand, that's exactly what Twitter did, ignoring the fact that JP Morgan were looking for a PR boost, and ripping the company to shreds in a ceaseless and hilariously effective hate campaign - including by respected journalists - that almost immediately led to the cancellation of the Q&A session, after seven long hours of viscious tweet responses.