Kevin Werbach has a good point to make about LinkedIn, which is that it’s not yet a killer app, but that as it evolves, a killer app may emerge. I think he’s right on the money here. In many cases, it makes sense just to build something and hope to be in the right place to get run over by something great. The challenge they face is getting the people who are early adopters to find the application useful, and eventually indispensible. I’d be curious to learn what people with massive rolodexes think of the application. My work doesn’t really revolve around contacts, so having a network at all is an improvement. For people who work their networks all the time, I wonder what it will take to get them to rely on LinkedIn.