From CNBC:
Facebook is rolling out a new tool that lets users find out why they’re seeing certain posts on their News Feed.
The new feature, called “Why am I seeing this post?”, essentially does what it says on the tin, showing a user the reasoning behind Facebook’s ranking of posts from friends, pages and groups on their timeline.
Users will also be shown options to let them tell Facebook whether they want to see posts like it again in future. The controls include the option to unfollow a person, page or group, edit News Feed preferences or manage privacy settings
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