Videos of flash-flooded rivers and overflowing pavements went viral on social media on Wednesday as residents in parts of Hong Kong grappled with more than 70 mm of rainfall in 24 hours. The intensity of the floods prompted some users online to claim a picture of the extreme was outdated or even AI-generated, only to be proved wrong when a clip was shared by another person. “I actually live in the village houses right above that spot, so I wanted to post the video I took this morning to prove...