if you've used Snapchat Bitmoji's and you love it, well guess what, Facebook now has its own version of bitmoji and its called Facebook avatar.
This feature is available on the Facebook app as it allows you to create animated like bitmoji on Facebook and share it with your friends on Facebook as posts or stickers. I came across its full guide here
https://www.isogtek.com/facebook-avatar/
Enough spoilers, check out the Facebook avatar feature and start creating your Facebook avatar when it's out.