WhatsApp would be huge. A WhatsApp PBX, auto-responders, etc. But it seems like FB would nix access pretty quickly so you'd constantly be playing whack-a-mole.

WhatsApp would be huge. A WhatsApp PBX, auto-responders, etc. But it seems like FB would nix access pretty quickly so you'd constantly be playing whack-a-mole. They might even terminate the underlying account, making it too risky for businesses to even consider.