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All around the world, there are conspiracy theorists who believe the Earth is flat. And their community seems to be growing, judging by attendance at flat Earth conferences and events.

Flat Earthers say YouTube was key in helping them spread their message, but the Google-owned company says it's taking action to prevent conspiracy videos from reaching large numbers of people.

So how - and why - has YouTube enabled the flat Earth community to grow?

Video journalist: Marco Silva