Since the very first Snowden leak a year ago, one of the more common refrains from defenders of the program is "but it's just metadata, not actual content, so what's the big deal?" Beyond the fact that other programs do collect content, we've pointed out time and time again that the "just metadata, don't worry" argument only makes sense if you don't know what metadata reveals. Anyone with any knowledge of the subject knows that metadata reveals a ton of private info. Furthermore, we've even pointed out that the NSA regularly uses "just metadata" to pick targets for drone assassinations. As one person called it: "death by unreliable metadata."