Its not just lies either, its honest mistakes that are novel and/or cause emotional reactions. The retweet button is a mistake amplifier
https://science.sciencemag.org/content/359/6380/1146
People need to become aware just how bad most social media content that reaches them is.
* By being easily digestible and easy to state while the the refutation requires a long form explanation.
* By spreading faster and being repeated more often than the truth preying on our innate bias toward things we’ve heard before.
* By being tied to an unrelated political ideology or issue of intellectual or moral superiority.
* By gaslighting where the authority of truth tellers are undermined.
* As a form of the Streisand effect where any attempt to discredit or silence lie tellers is parlayed into more evidence for its truth.
* When the belief in the truth imparts a material, social, or image cost to the would-be believer.