The buzz about a chat app is more important than the app itself. The usefulness of the app is proportional to the size of the social network. The most difficult thing to build and the most valuable part of a chat app is the social network. WhatsApp wasn&#x27;t worth $19 billion because of the quality of the software.<p>Buzz, marketing, promotion, virality, user aquisition in general, are the most important thing for Signal to be working on.