Reactions let you quickly express how you feel about a post or comment and show engagement with other people’s content without leaving a written reply.
Reacting to posts and comments
Here's how to react to posts and comments:
Navigate to the post or comments you'd like to react to.
Click the Reaction button.
Choose the emoji that represents the reaction you want to convey and click on it to react to the post/comment.
You can add multiple reactions to the same post/comment. Simply repeat the process outlined above.