WhatsApp is going to start sharing your data with Facebook and using it for ads. Unless you tell it not to. The first option to opt out is given when WhatsApp asks you to agree to its updated terms and conditions. Instead of tapping Agree, select "Read more about the key updates to our Terms and Privacy Policy". If you’ve already updated to the latest version, go into your WhatsApp settings. Tap “Account" and uncheck the box “Share my account info”