https://qz.com/1234223/whatsapp-co-founder-jan-koum-uses-facebook-to-share-pro-trump-stories/ >WhatsApp was acquired by Facebook for $19 billion in 2014. One of the men who founded the chat app, Brian Acton, generated headlines by calling for people to #DeleteFacebook following news of the unauthorized use of 50 million users’ personal data by Cambridge Analytica, a consulting firm that claims credit for Donald Trump’s election victory. >But Acton’s WhatsApp co-founder, Jan Koum, seems to have no qualms using his Facebook account.