The
firehose of falsehood, or
firehosing, is a propaganda technique in which a large number of messages are broadcast rapidly, repetitively, and continuously over multiple channels (such as news and social media) without regard for truth or consistency. Since 2014, when it was successfully used by Russia during its annexation of Crimea, this model has been adopted by other governments and political movements around the world.
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The high volume of messages and the use of multiple channels are effective because people are more likely to believe a story when it appears to have been reported by multiple sources. In addition to the recognizably Russian news source, RT, for example, Russia disseminates propaganda using dozens of proxy websites whose connection to RT is "disguised or downplayed." People are also more likely to believe a story when they think many others believe it, especially if those others belong to a group with which they identify. Thus, an army of trolls can influence a person's opinion by creating the false impression that a majority of that person's neighbors support a given view.
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Traditional counterpropaganda efforts are ineffective against this technique. As researchers at RAND put it, "Don't expect to counter the firehose of falsehood with the squirt gun of truth."