These trolls haven't been appeared from thin air. The same (giant) companies are behind them. See here for example: "Apple And Microsoft Behind Patent Troll Arm

These trolls haven't been appeared from thin air. The same (giant) companies are behind them. See here for example: "Apple And Microsoft Behind Patent Troll Armed With Thousands Of Nortel Patents" http://news.ycombinator.com/item?id=4027246 http://news.ycombinator.com/item?id=4027246 (And don't think Facebook or Google are any better than Apple or MS. They just don't have enough patents.)