Last October, Facebook said that it would soon roll out Dark Mode for Messenger. But it's been more than four months since then and Facebook still hasn't rolled out this much-awaited feature to its users. Well, even though the social media giant hasn't officially enabled this feature for everyone, there is a workaround that lets you enable it easily. The Dark Mode on Facebook Messenger can be enabled by sending a moon emoji (this one:🌙) in a chat. As soon as you send this emoji, you will see a message pop-up at the top that reads "You Found Dark Mode!". Below that will be a button...
Source: https://www.gsmarena.com/you_can_enable_facebook_messengers_dark_mode_with_a_moon_emoji-news-35805.php
