[andrewcross]

Network effects are great...when you have them. But in the beginning you won't. That's why if you can provide value to an individual user without requiring network effects, it will make your life a lot easier.

In this case, if you get bloggers using your product, logging their trips, etc, you'll slowly build up your content. Once it's comprehensive enough for travellers to get value from it, you'll be able to build network effects from a much stronger position.