WDYK stands for Who Do You Know. It's the list that runs my whole business.
It filled my first networking session with 49 people. I don't run ads, and my email list sat untouched for the best part of 18 months. The October round of this challenge got over 40 sign ups the same way, with no ad spend.
The challenge is built on Nurture First Selling®, because content creates visibility, but conversation creates revenue.