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Even if you don't get your information from Facebook, if enough people do, then Facebook can influence the outcomes of elections which directly affect your life. If you are a plumber who doesn't use Facebook, and Facebook promotes a bunch of content that foments anti-plumber sentiments, you may be attacked on the street by an angry mob of Facebook users.

It is not possible to design your life so that you completely avoid the influence of an entity as large and powerful as Facebook, just like the citizens of most countries cannot design their lives in a way that fully avoids the influence of the U.S. government.