[brownbat]

There's a long series of experiments on a phenomenon called "the hostile media effect."

Basically if you show two opposing interest groups the same film clip, both will rate it as highly inaccurate and biased against their point of view.

https://en.wikipedia.org/wiki/Hostile_media_effect

I'm excited for the results of Facebook's experiment, but fully expect this to remain an unsolved problem for the foreseeable future.