Everyone making this "general purpose computer" argument is disingenuously taking care to define the term specifically to rule out game consoles while covering the iPhone. The fact is that modern gaming consoles are general purpose computers complete with media center capabilities, operating systems, application stores, multitasking, networking, web browsing, streaming, etc.
Just like the case of the iPhone, the only thing that makes them appear otherwise is what software their respective owner companies choose to allow or disallow.