Re your point on having to thoroughly explain your revenue model to investors, there are some VCs/investors who are happy to let this emerge, odd as that may so

Re your point on having to thoroughly explain your revenue model to investors, there are some VCs/investors who are happy to let this emerge, odd as that may sound. For instance, I believe that Fred Wilson [of A VC blog fame] has commented along these lines about his investment in Twitter. In some of these instances, the plan appears to be to focus on building a large active user base, preferably one that gets "locked in" via a network effect and then figuring out how to monetise. I am interested to hear about the "bunch of possible directions" you can see. Can you elaborate?