One of the downsides of being a "celebrity" Tweeter is the preponderance of people who seem to hang about in dingy bedrooms in their dirty underwear "trolling". A troll is somebody who sends abusive tweets, often to celebrities- some are simply negative comments on a career, others are far more abusive and personal. Accepted practice is "do not feed the trolls". The general feeling is that these low-lives need the attention and that by replying or interacting with them you are giving them what they want. I beg to differ.