The Internet has sometimes been called an echo chamber.This is illustrated by the:

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Extremist groups, such as Al-Qaeda, use the Internet to recruit members by targeting vulnerable individuals and creating online echo chambers that reinforce extremist views. This is a prime example of how the Internet can function as an echo chamber, as like-minded individuals seek out and reinforce each other's beliefs, often without exposure to opposing viewpoints.

The Internet Has Sometimes Been Called an Echo Chamber