This app was mentioned in 7 comments, with an average of 1.00 upvote
You cab use gif keyboard, it's compatible with Messenger, Hangouts and whatsapp and you don't even need to change your keyboard!https://play.google.com/store/apps/details?id=com.riffsy.FBMGIFApp&hl=fr (first time i comment on this sub so i don't know if it's gonna work)
linkme : GIF Keyboard.
I have this one, for Android: https://play.google.com/store/apps/details?id=com.riffsy.FBMGIFApp
I like it so far, there are quite a lot of them so I'll probably try a few to see which one has the best gifs. It's starting to feel like a long term goal; find the perfect one lol
~~linkme: GIF Keyboard~~
Oops no LinkMe bot here. https://play.google.com/store/apps/details?id=com.riffsy.FBMGIFApp