Facebook has problems with browsers. Sandboxed away, no file system access, and user having full control of their browser (ad blocking, noscript, and similar).

Facebook has problems with browsers. Sandboxed away, no file system access, and user having full control of their browser (ad blocking, noscript, and similar). With VR you're in full control of writing a driver (and if you go full Sony style rootkit most people won't even read the news story), you have full control of what launcher/store users must use (no troubling addons like ad blocking), you have full access to video of the room that VR is happening in (if you choose to), eye tracking as you mentioned, mouth tracking is getting popular, and have full access to anything you can fit on a fitness watch (heart rate, blood pressure, alone is enough to guess a person health especially since you have their movement logs. maybe someday in the future sweat analysis).