How to unlock Facebook Messenger's hidden 'Dark Mode'

Facebook Messenger users can finally rejoice: There is now an easy way to mitigate late night eye strain and save your battery — as long as you know how to unlock the hidden feature.

In the last few days, Facebook has started quietly rolling out a secret "dark mode" for Messenger that gives the app an inverted, white-text-on-black-background look. The color scheme makes it easier to read messages from the app in the evening.

Facebook has chosen to add this feature in a pretty unconventional way, too: To get the dark mode option in Messenger settings, you need to send someone the "crescent moon" emoji. This one: 🌙 . Read more...