You can put emoji in a comment for similar effect.<p>The facebook system allows a few critical things:<p>- a simple tally of reactions. With an open-ended set of emoji, it&#x27;s a bit silly to tally emoji responses. With 6 options, the tallies are interesting.<p>- advertising. These six actions are a known quantity and can be baked into their advertising and display algorithms at every level. Using emoji, you&#x27;d have to build some kind of emoji-emotion-algorithm which classifies the use of all emoji in real time to a small set of factors for use in the algorithm<p>But yeah nothing is stopping you from filling up facebook messages and comments with :poo: emoji and stickers and gifs.