To add a reaction, one needs to just hover over the "Like" button to see the reaction image options and then tap whichever one they would like to use. Facebook decided to add Reactions so that were more ways people could easily and quickly express their feelings. Also, when you see a post that someone has died, you no longer have to be in the awkward position of “liking” this.
In order to determine what emojis they wanted to offer, Facebook conducted research. They surveyed people to see how they would react to different emojis. They also looked at how people were commenting on posts and at the top stickers and emoticons that were being used.
But, after all, why would you want to use one of the emojis if you could use Trump’s spray-tanned face or Pikachu? A new extension of the Google Chrome and Firefox browsers lets you do just this. You simply just have to install the extension and then you are free to choose which pack you would like. All the reactions remain the same though.