Facebook holds at least two patents to track user eye movements, but denies that it's currently developing the technology.
"Like many companies, we apply for a wide variety of patents to protect our intellectual property. Right now we’re not building technology to identify people with eye-tracking cameras," Facebook wrote in a 229-page response to a set of questions from the Senate Commerce, Science and Transportation Committee.
"If we implement this technology in the future, we will absolutely do so with people’s privacy in mind, just as we do with movement information (which we anonymize in our systems)." Read more...More about Facebook, Privacy, Security, Cybersecurity, and Mark Zuckerberg