FB would not have allowed him to make Whatsapp. It was built with a philosophy of correctness ("We can never drop a message") and privacy. Contrast that to FB's

FB would not have allowed him to make Whatsapp. It was built with a philosophy of correctness ("We can never drop a message") and privacy. Contrast that to FB's "move fast and break things" and disregard for privacy to the point that they stole users' call logs right off their phones. So there's no way they would have listened to Acton and let him build Messenger the way he wanted. Add to that the fact that Acton's ideas didn't yet have any market validation. Once WhatsApp was a proven success, FB was willing to pay for it, but even so they are now destroying what made it good - https://www.theverge.com/2018/4/30/17304792/whatsapp-jan-koum-facebook-data-privacy-encryption https://www.theverge.com/2018/4/30/17304792/whatsapp-jan-kou...