Bibliography (8):

1. Quantifying social organization and political polarization in online platforms

2. The Impact of Aggregators on Internet News Consumption

3. Exploring the effects of algorithm-driven news sources on political behavior and polarization

4. No Polarization From Partisan News: Over-Time Evidence From Trace Data

5. Multi-Sided Platform Strategy, Taxation, and Regulation: A Quantitative Model and Application to Facebook § Empirical Illustration—Facebook

6. Wikipedia Bibliography:

   1. Fake news

   2. https://en.wikipedia.org/wiki/Echo_chambers  :

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

   3. Natural experiment