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Facebook is once again making changes to their News Feed algorithm to make sure you don’t miss out on any important posts from your friends. In the event that you didn’t scroll down far enough in your News Feed, a new feature known as “Story Bumping” will automatically relocate relevant stories that you might not have gotten to back to the top of your feed. |
Source : Facebook improves News Feed, recycles older posts with Story Bumping - TechSpot