Sharing WhatsApp numbers is quick an can be done with everyone. It doesn't require your real name and doesn't share your list of friends by default.
It means I can freely share my WhatsApp number with my bank, my boss, the delivery person, the plumber, the clerk from the nearby cafeteria, clients, the driver of the tow truck, or my teachers, anyone.
But there is no way I'll share my Facebook or Intagram name/id with themn. That's more private and usually only done for friends or acquaintances.
It means I can freely share my WhatsApp number with my bank, my boss, the delivery person, the plumber, the clerk from the nearby cafeteria, clients, the driver of the tow truck, or my teachers, anyone.
But there is no way I'll share my Facebook or Intagram name/id with themn. That's more private and usually only done for friends or acquaintances.