Since Facebook acquired WhatsApp in 2014, users have wondered and worried about how much data would flow between the two platforms. Many of them experienced a rude awakening this week, as a new in-app notification raises awareness about a step WhatsApp actually took to share more with Facebook back in 2016.
None of this has at any point impacted WhatsApp’s marquee feature: end-to-end encryption. Messages, photos, and other content you send and receive on WhatsApp can only be viewed on your smartphone and the devices of the people you choose to message with. WhatsApp and Facebook itself can’t access your communications.
In practice, this means that WhatsApp shares a lot of intel with Facebook, including account information like your phone number, logs of how long and how often you use WhatsApp, information about how you interact with other users, device identifiers, and other device details like IP address, operating system, browser details, battery health information, app version, mobile network, language and time zone. Transaction and payment data, cookies, and location information are also all fair game to share with Facebook depending on the permissions you grant WhatsApp in the first place.