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Around the world, and against all scientific evidence, a segment of the population believes that Earths round shape is either an unproven theory or an elaborate hoax. Polls by YouGov America in 2018 and FDU in 2022 found that as many as 11% of Americans believe the Earth might be flat.

While it is tempting to dismiss flat Earthers as mildly amusing, we ignore their arguments at our peril. Polling shows that there is an overlap between conspiracy theories, some of which can act as gateways for radicalisation. QAnon and the great replacement theory, for example, have proved deadly more than once.

By studying how flat Earthers talk about their beliefs, we can learn how they make their arguments engaging to their audience, and in turn, learn what makes disinformation spread online.

In a recent study, my colleague Tomas Nilsson at Linnaeus University and I analysed hundreds of YouTube videos in which people argue that the Earth is flat. We paid attention to their debating techniques to understand the structure of their arguments and how they make them appear rational.

One strategy they use is to take sides in existing debates. People who are deeply attached to one side of a culture war are likely to wield any and all arguments (including truths, half-truths and opinions), if it helps them win. People invest their identity into the group and are more willing to believe fellow allies rather than perceived opponents a phenomenon that sociologists call neo-tribalism.

The problem arises when people internalise disinformation as part of their identity. While news articles can be fact-checked, personal beliefs cannot. When conspiracy theories are part of someones value system or worldview, it is difficult to challenge them.

In analysing these videos, we observed that flat Earthers take advantage of ongoing culture wars by inserting their own arguments into the logic of, primarily, three main debates. These debates are longstanding and can be very personal for participants on either side.

First is the debate about the existence of God, which goes back to antiquity, and is built on reason, rather than observation. People already debate atheism v faith, evolution v creationism, and Big Bang v intelligent design. What flat Earthers do is set up their argument within the longstanding struggle of the Christian right, by arguing that atheists use pseudoscience evolution, the Big Bang and round Earth to sway people away from God.

A common flat Earther refrain that taps into religious beliefs is that God can inhabit the heavens above us physically only in a flat plane, not a sphere. As one flat Earther put it:

They invented the Big Bang to deny that God created everything, and they invented evolution to convince you that He cares more about monkeys than about you they invented the round Earth because God cannot be above you if He is also below you, and they invented an infinite universe, to make you believe that God is far away from you.

The second theme is a conspiracy theory that sees ordinary people stand against a ruling elite of corrupt politicians and celebrities. Knowledge is power, and this theory argues that those in power conspire to keep knowledge for themselves by distorting the basic nature of reality. The message is that people are easily controlled if they believe what they are told rather than their own eyes. Indeed, the Earth does appear flat to the naked eye. Flat Earthers see themselves as part of a community of unsung heroes, fighting against the tyranny of an elite who make the public disbelieve what they see.

The third theme is based on the freethinking argument, which dates back to the spirited debate about the presence or absence of God in the text of the US constitution. This secularist view argues that rational people should not believe authority or dogma instead, they should trust only their own reason and experience. Freethinkers distrust experts who use book knowledge or nonsense math that laypeople cannot replicate. Flat Earthers often use personal observations to test whether the Earth is round, especially through homemade experiments. They see themselves as the visionaries and scientists of yesteryear, like a modern-day Galileo.

Countering disinformation on social media is difficult when people internalise it as a personal belief. Fact-checking can be ineffective and backfire, because disinformation becomes a personal opinion or value.

Responding to flat Earthers (or other conspiracy theorists) requires understanding the logic that makes their arguments persuasive. For example, if you know that they find arguments from authority unconvincing, then selecting a government scientist as a spokesperson for a counterargument may be ineffective. Instead, it may be more appealing to propose a homemade experiment that anyone can replicate.

If you can identify the rationality behind their specific beliefs, then a counterargument can engage that logic. Insiders of the group are often key to this only a spokesperson with impeccable credentials as a devout Christian can say that you do not need the flat-Earth beliefs to remain true to your faith.

Overall, beliefs like flat-Earth theory, QAnon and the great replacement theory grow because they appeal to a sense of group identity under attack. Even far-fetched misinformation and conspiracies can seem rational if they fit into existing grievances. Since debates on social media require only posting content, participants create a feedback loop that solidifies disinformation as points of view that cannot be fact-checked.

More here:
I watched hundreds of flat-Earth videos to learn how conspiracy theories spread and what it could mean for fighting disinformation - The Conversation