The Chances that every of those Users got hacked at the same Time is like 1/100.000.000 so it`s more obvious that Fullscreen got either hacked, infiltrated or compromised in some Way.
Now somone has probably full Control over their CMS which pretty much means that he can do everything that FullScreen could do with the YouTube Channels or each single Video on those.
Ladies and Gentlemen we probably have just experienced the first public known take over of a Network and that it did hit Fullscreen is even worser because those People are Ex-YouTube-Employee who should know how to prevent s**t like this.
I don`t know if I should lough about the current Situation or simple ask their Team if they are even fully aware of what just had happend?!