Activity Feed Stickers are little emoticon images that you can pop into your Activity Feed posts.
Adding them is very easy.
Type your message until the point where you want to add your Sticker, then click the Sticker Button – it is at the top right corner of where you write your Activity Feed posts and looks like a smiley face (see picture below).
The Stickers will pop up and you can choose which ever ones you want to add.
Click on the sticker you like and you will see a little “shortcode” appear in your post.
When you click on “Update Post” the “shortcode” turns into the Sticker you chose.