The social security number of the internet.

A gmail address is basically the social security number of the internet.
The number of people with a gmail account is astonishing.
- ios or android
- mobile or desktop
- safari or chrome
- professional or personal
- human or bots

Pick any corner of the internet and you'll find gmail accounts.
It's become so common we've forgotten how wild that is, especially for something owned by a individual company.

That's CRAZY impressive.