Social networks like facebook can create “echo chambers,” where users see posts only from like-minded friends and media sources. To demonstrate how reality may differ for different Facebook users, The Wall Street Journal created two feeds, one “blue” and the other “red.” (USA 2019)

Video channel of the International Monetary Fund (2021)

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The term is used by the social network to justify the mass removal of influence campaigns linked to foreign governments (2018-19).