Instant start-up formula: 1. Look at what other start-ups are doing (for instance, sharing cars). 2. Do the same thing in a different industry (like sharing ho

Instant start-up formula: 1. Look at what other start-ups are doing (for instance, sharing cars). 2. Do the same thing in a different industry (like sharing hotel rooms). This way, you can present your idea to VCs as "The X of Y," which is about all VCs have time to listen to. That said, please enjoy my free start-up ideas: 1. Facebook for aligators. 2. The Airbnb of places in line to buy tickets. 3. Like Twitter, but you can only post emoticons.