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Why are there so many conspiracy theories swirling in the online world about billionaire philanthropist Bill Gates? Jane Wakefield explores why people might seek conspiracy theories, and asks if they are just part of the online rumour-mill, or can cause actual harm. Jane hears from Rory Smith from fact-checkers First Draft News, from Marianna Spring from the ´óÏó´«Ã½â€™s anti-disinformation team, and from Professor Joseph Usinski, who argues that these kinds of theories have always been a part of life, and most die away naturally. But Rory Smith and Bill Gates himself warn that they could harm vaccine uptake, and are more than a bit of online fun. Photo of Bill Gates, photo credit AFP/Getty