6. Ryan Air
Whatever you do, don't let the boss loose on Twitter, especially when you work for Ryanair and your boss is CEO Michael O'Leary, who clearly wasn't briefed on the normal etiquette of Twitter Q&As. O'Leary spent the planned Q&A session ostracising female passengers with some hilariously outrageous sexist comments and casual flirting, as well as forgetting to tag his own tweets with the #GrillMOL hashtag, before displaying frankly uncharacteristic self-awareness in evaluating Ryanair's biggest mistakes...
Quite why any company thinks that the CEO is the right person to interact with customers is baffling considering how removed the upper echelons of management and directors tend to be from clients, and O'Leary did nothing more than highlight exactly how much of a silly ideas the whole PR stunt was.