If it is an excellent tool by itself, then it has a much better chance of acceptance. That is, if you yourself can't stop using it regardless of who else is using it, it is a stronger product. del.icio.us is like that- I started using it because it was a nice central place to store bookmarks regardless of who else was using it. It was only later that I started noticing how many others were bookmarking and even started using it as a search engine. Flickr- same thing. Youtube & myspace- still kind of the same- say I was the first user of youtube, I may still like it so that I can put my videos in one place and shoot off an email to my buddies to go have a look. The point is the tool better be compelling without a community or you'll never be able to grow a community. Even here the content coming from one poster is compelling (enough) even before a dozen users started commenting and posting, etc. Focus on the tool. I couldn't agree more.
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.
Community is vastly overrated, since the easiest way to appeal to a larger group of people is to be comfortably generic. The best tools for a community because they're versatile and extensible, so the community provides value. If that isn't the case for the startup, there isn't a case for community.
It depends a lot on the site. Theres far too many sites that just add community features when its not needed. My friends are on facebook and twitter, they dont need to be anywhere else.
So judge it based on your app. Is the hassle of adding your friends to the site going to be far smaller than the benefit?
"Is the hassle of adding your friends to the site going to be far smaller than the benefit?"
Good point. If it's more useful to you to have more of your friends on the site then you will try to recruit them. But if it's still not vauable at all to them, then they will just think you are sending them junkmail. I think the most thriving online communities are the ones that grow organically. History shows us, it doesn't matter what the tool is, if people can use it to communicate with one another, they will find a way.