... the VPN-based security app from its Onavo team, to see how Snapchat ... This isn't the first time Facebook has used Onavo's app usage data to make ... to buy WhatsApp, as Facebook knew that WhatsApp's dominance in ... Onavo Protect, the VPN client from the data-security app maker ... Instead, Onavo's VPN allow Facebook to monitor user activity across apps, giving Facebook a big ... in a numb..