- Jan Koum quit Facebook to collect Porsches — here’s why he owes everything to the German sports carBusiness Insider
- Jan Koum is leaving Facebook and WhatsApp users will end up paying the priceBGR
- WhatsApp Billionaire Co-Founder Departs To Play Ultimate Frisbee And Collect PorschesHot Hardware
- One of WhatsApp’s founders is leaving Facebook amid the data disputePittsburgh Post-Gazette