An anonymous reader quotes a report from The Sun: The social network applied for a patent to capture pictures of a user through their smartphone. The creepy designs, which date back to 2015, were discovered by software company CBI Insight, which has been analyzing Mark Zuckerberg's "emotion technology." Patent documents contain illustrations showing a person holding a smartphone with a camera taking a picture from which "emotion characteristics" like smiling or frowning are detected. If the person appears to like what they're seeing, Facebook could place more of the same type of content in front of them. Patents don't always make it through to the end product, so it's not clear whether Facebook will bring out this new feature. Researchers at CBI Insights warned that the plans could put a lot of people off using the service. Facebook appears to have tested out similar technology to work out which emoji to send to people using a selfie.