"We use the information we collect to send you promotional messages and content and otherwise market to you on and off our Services. We also use this information to measure how users respond to our marketing efforts."
"Virtual reality offers an unparalleled level of access to data for advertisers. Before metrics were measured in how long someone watched a video or how many times a link was clicked, but with VR you can get far more granular. An ad executive at Coke, for instance, could tell just how long you stared at the Coke bottle cleverly placed inside your favorite game as an in-game ad and use that data to better place it in the game for you next time."
It amazes me that before this technology is even out and proven to work, and be a success with consumers, Facebook have already set up monitoring software to develop even more targeted advertising. At least Microsoft had the decency to wait a few versions with Windows first...