Facebook might bring an eye-tracking technology tools that will let the social media giant detect users' eye movement and emotions in future. However, it has denied using it as of now.
In a 229-page document addressed to US Congress in the wake of Cambridge Analytica data breach scandal, Facebook revealed that it had investigated building the technology, Fortune reported on Wednesday.
In the documents, Facebook admitted that it allows advertisers to target users based on their "interests" and "behaviours".
"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," according to the document.
"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," it added.
Facebook already has two patents titled "Dynamic eye tracking calibration" and "Techniques for emotion detection and content delivery".
"Facebook is accused of violating user privacy by collecting data derived from Facebook users' faces in photographs," the report noted.
When Facebook CEO Mark Zuckerberg appeared before the US Congress in April, he faced several questions from lawmakers. But his in-person testimony left them with several lingering questions.
(with IANS inputs)