Forecasting Rogue Clouds

What is a rogue cloud?   " ... IT managers say "rogue cloud implementations" in which business managers sign up for services without getting IT approval is among their biggest challenges. This is according to a survey on avoiding hidden cloud costs that was sponsored by Symantec with interviews and polling done by ReRez, in which some 94% of the 3,236 information-technology managers in 29 countries said their companies either already were using cloud services or discussing how to do so.... "