WhatsApp has to stop sharing information with parent company Facebook until the required legal protection of users is safeguarded. This is what European privacy watchdogs, united in the Article 29 Working Party, have written in an open letter to WhatsApp. The watchdogs responded to a recent modification in WhatsApp's terms of use, which states that the messenger service will also share data with Facebook. According to WhatsApp, this will improve customer experience, but in practice, it will predominantly serve a commercial goal: sending service messages and targeted advertisements to users.