“As Del Vicario and her coauthors put it, “users mostly tend to select and share content according to a specific narrative and to ignore the rest.” On Facebook, the result is the formation of a lot of “homogeneous, polarized clusters.” Within those clusters, new information moves quickly among friends (often in just a few hours).

The consequence is the “proliferation of biased narratives fomented by unsubstantiated rumors, mistrust, and paranoia.””

How Facebook Makes Us Dumber
https://www.bloombergview.com/articles/2016-01-08/how-facebook-makes-us-dumber
via Instapaper