-- approximate quote from someone I can't recall
This is not quite exact in reality, but I think it captured the difference in essence between the two social platforms.
It used to be true that I only had friends on Facebook. But nowadays I have way more acquaintances than friends. My point is, if Facebook was still today only about people I am friends with I would still use it as much as 4 years ago. But nowadays the signal to noise ratio is way too low for me to really get anything out of the platform:
* I'm reminded of birthdays of people I don't even know how I met
* I see pictures on my news feed from people partying that I don't recognize...
PS: I might not be a good example of the average user, since I've also been moving from one country to another over the past few years accelerating the process by witch everyday friends turn into acquaintances
EDIT: fixed formatting