Facebook has an ingrained formula that tracks exactly how you communicate with your friends and afterwards kinds appropriately. Source
Facebook Friends List Order Meaning 2018
While the exact ranking formula is secret, it does think about the following variables:
* How often you visit your friends' accounts
* Just how usually you click on your friends' links
* Photos/tags alike
* Typical groups/ associations
* utual Friends
* Exactly how frequently you search for friends
* Relative popularity (just how prominent your friends are among your mutual connections).
So, the real sorting is not arbitrary, yet rather very carefully crafted to facilitate interaction as well as website interactions.
