A wild conspiracy theory has started swirling on social media over claims that President Biden did not sign his resignation letter. The 81-year-old released announced he was standing down from his presidential race by sharing a letter to his social media on Sunday afternoon. Speculation has since started to grow, with conspiracy theorists poring over its authenticity, with some believing he never actually signed the letter himself. His signature on the letter shared on Sunday show his name being underlined, which according to some commentators he has never done before. Billionaire Bill Ackman has been one of those sharing the...