Before we get into the how, let’s briefly discuss the why. Facebook originally worked on a traditional timeline feed similar to Twitter. (Twitter's algorithm has recently changed, but it still largely based on time.) Posts were displayed in a chronological order and you saw the most recent stuff first. As users engaged more and more, there were a number of posts which Facebook, and even the users, considered content worthy that got lost in the feed. This prompted Facebook to make a change.
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