This is a big step in the direction of data collection. Imagine gaming with the goggles on and FB is tracking your eye movement, monitoring your heart rate and how you react to certain visuals. Say you are playing DeadSpace or some other jumpy game and they see that when you get "scared" your heart beat becomes abnormal. They could then use that data to insert an ad for a local heart specialist or some fancy new heart medication. I'm not against new tech but people should always be informed on what data is being collected and most of the time that is not the case.