WhatsApp's Global Dominance and Economic Mysteries

WhatsApp is a messaging app used by people all over the world.

It shows who is online and when they were last seen, making it very popular.

However, because it works on almost every type of phone, it is hard to know how to make it better for everyone.

The app is so big and used by so many people that it is difficult to optimize.

People are interested in studying WhatsApp because it is deeply connected to how people feel and communicate every day.