It's been awhile since the ASAE Annual Meeting, but I recently came across an Associations Now re-hash of a few sessions, including the one by friends Ben Martin and John Chen that sparked so much commentary about the value - or lack thereof - of lurkers in online communities.
Just to clarify, a "lurker" is a common term for someone who consumes content but does not create content, i.e. they read but don't create. I have to say that I totally disagree with the idea that lurkers are of no value in online communities. I see every lurker as both an asset to the community just by virtue of lurking, after all, if your members didn't read/consume/lurk, then it'd be much more unlikely that other members would create. Also, keep in mind that every lurker is a potential future contributor.