The man who Mark Zuckerberg says taught him about the power of encryption is leaving the Facebook family.

The departure of WhatsApp CEO and cofunder Jan Koum comes after Facebook's biggest privacy scandal to date. And six months after WhatsApp cofounder Brian Acton left the company and joined the #DeleteFacebook movement. Facebook bought the chat app, which highlights and promotes encryption and user privacy, in 2014 for more than $19 billion.

In a Monday Facebook post, Koum wrote it was time for him to "move on." He plans to spend time "collecting rare air-cooled Porsches, working on my cars and playing ultimate frisbee."

The Washington Postsaid Koum will also leave the Facebook board of directors. Koum had issues with Facebook's approach to privacy, user data, and encryption, unnamed sources "familiar with internal discussions" told the Post. Facebook's poor privacy protections were exposed last month during the fallout of the Cambridge Analytica scandal, which centered on a quiz app that sucked up user data, and their friends' data.

Facebook CEO Mark Zuckerberg responded to Koum's departure post thanking him "for everything you've taught me, including about encryption and its ability to take power from centralized systems and put it back in people's hands."

Despite the apparent hard feelings reported by the Post,Koum wrote, "I'll still be cheering WhatsApp on -- just from the outside."

• ·I used the Pixel 9 Pro XL in the shower — does the screen work when wet as claimed?
• ·围绕报告精神 为党建工作建言献策
• ·‘US will fight for top spot’
• ·广东乡村歌手大赛季军陈英华：《南方农村报》照亮我的音乐梦
• ·Venture Missionaries
• ·What to bring on a plane if your laptop is banned
• ·'I don't know how I did it': Popyrin
• ·Who are the three US detainees held by North Korea?
• ·'Metaphor: ReFantazio' hands
• ·贯彻报告精神 做好未来五年各项工作
• ·New Jersey halts police use of creepy Clearview AI facial
• ·NZ players hopeful despite painful World Cup exit
• ·'Please find her': Man dies amid 25
• ·NBA star fined after social media catches him threatening fan
• ·Iran pullout a message to North Korea
• ·Coronavirus might put a wrench in Apple's iPhone production plans