Without a community you either have to create a sales force in-house or use outside "hired" labor/advertising. Essentially, without community, it will be up to you as a entrepreneur to evangelize your project. Community ensures viral growth through word-of-mouth advertising and it gives value to the network directly proportional to the number of users. I personally disagree that community is not necessary. But, I don't think delicious does either. For one, delicious has benefited greatly from it's community following. Yes, it is a tool, and I do use it - under the normal circumstance - as an individual using a tool he own privately. However, community allows me utility and efficiency when I can search for quality links tagged by others, or simply click tags that make sense when I'm saving a favorite. I think you shouldn't use the word ignore here, it seems out of context. Rather, I read him to mean you should focus on building a valuable tool for users and let the community follow. He never says to stifle community growth.