Facebook’s News Feed Knows What You Did Last Summer


When Facebook turned on News Feeds for the first time in September 2006, many users were spooked by the privacy implications of a system that logs and broadcasts your activity to your friends. However, much of the concern quickly subsided – perhaps because it’s worked so well, the system that powers Facebook’s News Feed hasn’t gotten much attention since then. As Facebook engineer Justin Rosenstein remarked this summer,

“News Feed works so well that it’s sometimes easy to forget how sophisticated it is under the covers.

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