According to a report in Tech Crunch, Facebook was testing out a "thumbs down" reaction in addition to the already available reactions.
"We're always testing ways to make Messenger more fun and engaging. This is a small test where we enable people to share an emoji that best represents their feelings on a message," the company was quoted as saying.
The difference would be the availability of a "Dislike" button in the Messenger. The same button would not appear in the list of reactions available for posts.
The new feature in Messenger would allow users to add reaction emojis next to the text in conversations. Users could do this by clicking on a button next to text.
In February, Facebook celebrated the first anniversary of "Reactions" and recorded 300 billion "Reactions" on posts and the "Love" reaction was used maximum times by its over 1.79 billion users.
"It's been one year since we could do more than 'Like' a friend's post, and in that time, there have been a total of 300 billion reactions on posts to date," Facebook said in a statement.