Facebook is testing a “dislike” button for the first time, in response to high demand from users.  The feature has been rolled out to a small number of people on the Messenger app, who now have the option to respond to individual messages. Facebook wants users to attach emojis to messages in a similar way to the “reactions” feature on the news feed.

Source: Facebook to trial ‘dislike’ button for first time in Messenger app overhaul | The Independent