We discuss how Airbnb achieved rapid growth not by building an audience from scratch, but by piggybacking on Craigslist's millions of users.

We explain how Airbnb engineers created a tool that let hosts automatically post listings to Craigslist with links redirecting back to Airbnb, effectively borrowing an existing audience.

We explore why the smarter growth strategy is showing up where audiences already gather rather than trying to build attention from zero.