Google and Facebook's dominance in digital advertising and news discovery in the US is a threat to diversity of ideas in the country (Mark Epstein/Wall Street Journal)

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Mark Epstein / Wall Street Journal:
Google and Facebook's dominance in digital advertising and news discovery in the US is a threat to diversity of ideas in the country  —  A political website pulled an article after Google's AdSense team threatened to withdraw advertising.  —  'A monopoly on the means of communication," …