Mr. Koum’s decision was earlier reported by The Washington Post. Mr. Koum and Mr. Acton, who met at Yahoo while doing a security audit for the company, founded WhatsApp in 2009. In 2016, WhatsApp said it would start disclosing the phone numbers and analytics data of its users to Facebook. By then, Mr. Koum had also shared his unease over Facebook’s data and privacy policies with others, according to the company executive who has spoken with Mr. Koum. Mr. Zuckerberg said in a comment on Mr. Koum’s Facebook post that he would miss working with Mr. Koum.

Source: New York Times April 30, 2018 22:22 UTC