Musk talks about how PayPal is a perfect case of viral marketing where one customer acts as a sales person by sending money to a friend and hence recruiting another customer. By the end of the second year, PayPal had a million customers with no sales force and no advertising budget, he says.
Related

Katrina Lake,
Stitch Fix
Making Entrepreneurship More Inclusive [Entire Talk]
Achieve personal success while advocating for structural change.
Video
50 minutes
Katrina Lake,
Stitch Fix
Making Entrepreneurship More Inclusive [Entire Talk]
Achieve personal success while advocating for structural change.

David Rogier,
MasterClass
Finding the Right Motivation [Entire Talk]
A personal mission is the strongest motivation to do the impossible.
Video
51 minutes
David Rogier,
MasterClass
Finding the Right Motivation [Entire Talk]
A personal mission is the strongest motivation to do the impossible.

Vlad Tenev,
Robinhood
Weathering a Storm [Entire Talk]
Speaking amid a controversy around Robinhood’s decision to temporarily halt trading of GameStop and some other volatile securities, Robinhood’s CEO explores the venture’s business model and mission.
Video
49 minutes
Vlad Tenev,
Robinhood
Weathering a Storm [Entire Talk]
Speaking amid a controversy around Robinhood’s decision to temporarily halt trading of GameStop and some other volatile securities, Robinhood’s CEO explores the venture’s business model and mission.