It's interesting how two veery big services came from the idea of setting up a real-time status.

Early Twitter as I remember was that when you post the status your followers would get an SMS notification with the status.

Jack mentions that here of a real-time status and also the same for WhatsApp. Where WhatsApp inventors thought about a way to set up a real-time status.

But they pivoted to something different. Only that Twitter is still more close to the original idea.