"Wow Users."

"a small geographical area, a vertical or smaller group of people"

"If your service requires user generated content, you should be supplying 10x what every other user is supplying."

"Yelp’s founders made all of their friends also become super users"

"Your goal is to get 1,000 happy users and that means you can do some things that won’t work for users after 1,000"

"Even though Foursquare is more about tips and friend-finding, it added a game layer of points and badges so that the early users could use the app even though their friends weren’t on it yet"

"Get Their Social Graph."

"Manually Create Marketplaces."

"On your way to millions of users, don’t forget you have to get 1,000 happy users first."

"Focus on a Niche."

"Become a Super User."