Onavo is a company based in Israel who was acquired by Facebook in 2013. Facebook uses Onavo to track users' activities on other social media platforms, and we do not recommend to use this VPN. You can read more about how Onavo works with Facebook, here. The “Protect Free VPN + Data Manager” is exclusive for Androids and iOS devices and to date there have been over 10 million Google Play downloads – proving their popularity. This app offers a VPN which will help to keep your data safe and secure