Zuck wants to know where your eyes are pointed, in what order, and for how long. Whether he is showing you "user content" (user generated for free) or "sponsore

Zuck wants to know where your eyes are pointed, in what order, and for how long. Whether he is showing you "user content" (user generated for free) or "sponsored content" (customer generated for free), they will build an adaptive attention model for you. Then they will show you what is most distracting/engaging. You have no control over where your eyes look. It is a gold standard in advertising. That attention model is likely worth more than even an extremely high end VR/AR/MR/XR setup. Guess what high resolution low latency binocular video requires, eye tracking for foveal rendering. You can do the calculations for 2x120Hzx(100deg)^2x(60pix/deg)^2 and multiple gaming GPUs can't keep up, transport HDMI/DP can't keep up, and display (MIPI/lpDP) can't keep up. Foveal rendering allows ~10x reduction in bandwidth, which makes it possible on mobile/wireless. "Sorry, honey, for all the billy goats in high heels... it was just a phase in college"