https://transparency.meta.com/en-gb/data/widely-viewed-content-report
So it may feel like Facebook is dead as you’ll often hear no one uses it anymore. But it’s not quite accurate given that it gets 3 billion monthly active users, making it the largest social media platform by far. But what to these billions of people see when they’re on it? According to Meta’s Widely Viewed Content Report, 18.7% of the content you see on your feed is stuff your friends are posting. About 12% is stuff your friend’s are re-sharing such as articles from a FB page or another friend’s video. But the largest source of feed content (at 32%) is what Meta refers to as ‘unconnected posts’.
These are post recommendations that Facebook thinks you’ll be interested in. That’s the algorithm getting to work, showing you stuff you have no connection to but you may end up liking. It’s generally the standard that most big-time social platforms use now. Try searching for something on YouTube. You’ll probably get some relevant videos, but interspersed between those search results will be videos totally unrelated to the search query, which the YT algo thinks you’d like to watch anyway.
