You couldn't possibly compare Gmail or Facebook with Whatsapp.
For many people, their Gmail id is their sole or primary id on the internet, used to identify them to scores of websites. It is their official online point of contact for various aspects of their online lives including their career, banking, social networking etc.
Facebook is their online social profile, which they spent thousands of hours curating.
Your Whatsapp id is merely your Phone no., (which was Whatsapp's main selling point). All interactions in Whatsapp are ephemeral in nature - Most people delete their conversations when their phone memory gets full. Compared to gmail and facebook, the switching costs are practically zero.
For many people, their Gmail id is their sole or primary id on the internet, used to identify them to scores of websites. It is their official online point of contact for various aspects of their online lives including their career, banking, social networking etc.
Facebook is their online social profile, which they spent thousands of hours curating.
Your Whatsapp id is merely your Phone no., (which was Whatsapp's main selling point). All interactions in Whatsapp are ephemeral in nature - Most people delete their conversations when their phone memory gets full. Compared to gmail and facebook, the switching costs are practically zero.