As a frequent commenter on a little Wordpress blog called That's My Answer!, I have some advice to both the moderators and the participants.
That's My Answer! is pretty active but it primarily a single-sided affair. Rarely do you get the regulars interacting with each other. The authors attempt to spur interaction by starting threads that require each poster to respond to the previous but that only goes so far. They don't really interact. They play the game and move on.
I have seen them post the occasional reader submission and I can see how that would instill a sense of belonging.
They really need to emphasize this aspect of the community. In the rules they specify that it is "Not a meme" but I don't see how this is a benefit. I think they SHOULD make it more of a meme to build a community. Once the people know each other they will return there to congregate.
Right now I post comments, I put thought into my responses with the intent to be at least a little witty or entertaining. Sometimes I post direct responses, suggestions or questions to the other participants and its like I don't even exist.
That is one of my pet peeve's. I don't put the blame solely on the readers though. The authors don't really encourage any form of amity.
So what would I do? I would post more questions from the fans. Emphasize the importance of commenting on the previous poster. Post questions that would involve users going out to the internet for answers and posting responses on each others blogs etc.
Simple questions and answers are fun enough but if there isn't any depth to it, its minimal design will ultimately result in a loss of readership.
Just thinking out loud.