Facebook is testing a new feature for Messenger that allows users to better protect their messages from prying eyes. When enabled, users will need to authenticate their identity using Face ID, Touch ID, or their passcode before they can view their inbox, even if their phone is already unlocked. You can also set a designated period of time after leaving the app for when you'll need to re-authenticate. The company is currently testing the new security feature among a small percentage of Messenger's iOS users, though it could eventually be available more widely, including on Android. "We want to give people more choices and controls to protect their private messages, and recently, we began testing a feature that lets you unlock the Messenger app using your device's settings," a Facebook spokesperson said in a statement.

Facebook researchers have developed Fashion, a system that uses artificial intelligence to recommend how to make an outfit more stylish. AI has been slow to penetrate subjective fields like fashion, so Fashion relied on humans to evaluate its suggestions. The technology could be used by digital assistants to provide personal styling or shopping advice. Can a computer learn to tell what is fashionable and what is not? Artificial intelligence researchers at Facebook believe it can.