The fact that there's little evidence is itself the problem. Facebook is manipulating the reach of some news sources over others but their methodology is comple

The fact that there's little evidence is itself the problem. Facebook is manipulating the reach of some news sources over others but their methodology is completely opaque. The choices about how the news feed works can't be entirely free of a subjective understanding of how the world works so the question isn't "is the new feed biased?", it's "how is it biased?". Without transparency, speculating is the only route we have to ask that question. At this point we know that Facebook has the potential to significantly influence political discourse with the choices it makes. The fact that those choices are hidden is a problem but a bigger problem is the influence itself. No privately held company should ever be allowed this level of (potential/actual) influence on political discourse.