San Francisco: The co-founder of WhatsApp, a messaging service owned by Facebook Inc with more than 1 billion daily users, said on Monday he was leaving the company, in a loss of one of the strongest advocates for privacy inside Facebook.
Jan Koum's plan to exit comes after clashing with the parent company over WhatApp's strategy and Facebook's attempts to use its personal data and weaken its encryption, the Washington Post earlier reported, citing people familiar with the internal discussions.
"It's been almost a decade since Brian and I started WhatsApp, and it's been an amazing journey with some of the best people," Koum, WhatsApp's chief executive, said in a post on his Facebook page referring to co-founder Brian Acton.
"But it is time for me to move on." He did not give a date for his departure and could not immediately be reached for comment.
Acton left the messaging service company in September to start a foundation, after spending eight years with WhatsApp.
Facebook Chief Executive Mark Zuckerberg commented on Koum's post, saying he was grateful for what Koum taught him about encryption "and its ability to take power from centralized systems and put it back in people's hands. Those values will always be at the heart of WhatsApp."
Facebook has battled European regulators over a plan to use WhatsApp user data, including phone numbers, to develop products and target ads. The plan is suspended, but WhatsApp said last week it still wanted to move forward eventually.
Stanford alumnus Acton and Ukrainian immigrant Koum co-founded WhatsApp in 2009. Facebook bought WhatsApp in 2014 for $19 billion in cash and stock.
WhatsApp, a pun on the phrase "What's up?," grew in popularity in part because its encrypted messages are stored on users' smartphones and not on company servers, making the service more private.
Concerns about Facebook's handling of personal information have grown since the social network's admission in March that the data of millions of users was wrongly harvested by political consultancy Cambridge Analytica. [nL1N1RO0QR]
Facebook has taken steps to generate revenue from WhatsApp, which unlike Facebook does not have advertising.
WhatsApp's management has fiercely opposed advertising, saying in 2012 that they did not want to be "just another ad clearinghouse" where the engineering team "spends their day tuning data mining."
Instead, WhatsApp charged a $1 annual subscription. It dropped that in 2016, moving towards a plan to charge businesses for specialised accounts.
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