Here we explain how to insert emoticons and stickers in comments on Facebook, both on the desktop and mobile versions. In addition to the standard emoticon options available when posting a status update, the comments field provides access to various stickers to add personality to your posts.
How to use EMOJIs on Facebook!
To add emoticons to a Facebook comment via the desktop site:
Go to the text box to enter a comment.
Write your comment as normal and enter the desired text. (Skip this step if you only want to comment with emoticons.)