I can appreciate your desire to have Hubski be about conversation. My favorite moments on the site come from my interactions with others. That said, there are plenty of posts that I "share" but don't comment on. Sometimes I just don't have anything to add. I'd rather someone not say something than say something just for the sake of it.

I will share a post if I enjoyed it and think someone else might too. Something might be extremely interesting and I just don't have anything to say about it. There are lots of posts that get full hub-wheels but have no comments and I think that this makes sense sometimes.

edit: I apologize BLOB_CASTLE, I think I may have misunderstood your post/comment. Do you mean that if you are going to take the time to post a link, you should have a description/comment in the "text" field? If that's what you mean, then I tend to agree. Even if you don't have anything to add, I think it's great when people put a snippet from the article in there to get a taste of what I'm in store for. You can often get an idea of the overall feel of an article from just one paragraph.