You can get this update by updating your Facebook app to the latest version.
HOW IT WORKS
Simply click & hold down the Facebook like button until it bring up other emoticon options, then select your desired emoticon. See image below…
I hope this Facebook emoticons are great despite the fact that i/we’ve expected a dislike button instead of those, do you think Facebook still need a DISLIKE button still? Some people are so full of sh** post and maybe, sharing out dislikes might just be the best reaction to nonsense!