The individual with ADD experiences the mind as a perpetual-motion machine. An intense aversion to boredom, an abhorrence of it, takes hold as soon as there is no ready focus of activity, distraction or attention. An unremitting lack of stillness is felt internally--a constant background static in the brain(.)
Some adults with ADD have told me that they speak so quickly partly because so many words and phrases tumble into their minds that they fear forgetting the most important ones unless they release them at a fast rate.
Although poor social skills generally accompany ADD, this is not universal. One type of ADD child is socially adept and wildly popular. In my experience, such success hides a lack of confidence in important areas of functioning and masks a very fragile self-esteem, but this may not emerge until these children grow into their late teens or early twenties.