Kevin Systrom of Instagram used to work for us as a consultant in the early days of Mint. I knew him a long time ago. Maybe I could have gotten in there. But with photo sharing, I don't know if there's an obvious business model. I don't think there's a competitive, sustainable advantage.

Mint's business model became, 'We'll go for free, and then we'll find these savings opportunities for you.' You know, better interest rate on your credit cards, when should you consolidate your student loans, when does it mathematically make sense to refinance your mortgage, and Mint figures all that stuff out for you.

Money is available from investors as long as you have a great business model and a talented leader.

You know your business model is broken when you're suing your customers.

Napster was predicating its business model on violation of copyright.

Eviction is part of a business model at the bottom of the market.