This week, according to The New York Times, Facebook is planning to integrate its three standalone messaging platforms into a single, unified system. This would mean that someone using Facebook Messenger would be able to message someone on WhatsApp without having to have an account on that platform. According to a spokesperson,
We want to build the best messaging experiences we can; and people want messaging to be fast, simple, reliable and private. We're working on making more of our messaging products end-to-end encrypted and considering ways to make it easier to reach friends and family across networks.
All of this might sound good on the surface, but there is one big problem with the concept: Facebook will never implement end-to-end encryption on all of its messaging platforms. If they were to encrypt all messaging, they would lose their single biggest source of advertising information within their ecosystem. What you post on Facebook and Instagram helps, but not nearly as much as that personal and direct communication between friends. To encrypt that would mean that all of that information is lost to their algorithms.
A foundational principle of WhatsApp is that all communications are encrypted, but the other two have no such promise with their users. That means that, if a single gateway is created between the three platforms, it will need to be an open gateway, leaving any message that leaves WhatsApp unencrypted. With an open gateway, it leaves new vulnerabilities into the WhatsApp system, and will ultimately create confusion for WhatsApp users about what is and is not private communications.
The idea of a unified messaging system sounds good at first, but the reality is not nearly as rosy.