I'm seeing a lot of reddit hate here, and a lot of the points are valid. However, I disagree that the structure of reddit - communities focused around a topic or theme - is a bad thing. A lot of amazing things have happened on reddit over the years, and a large part of it was because a group of like-minded people were able to come together around a common interest. I dislike facebook simply because it is too general: I never have confidence that people will be interested in what is on my mind. On reddit, I simply find the subreddit devoted to it and start a discussion there. The problem subs are mostly the ones that are too general - think "funny" or "pics". Unsubscribing from them mostly solves that problem.

I'm new here and I'm still uncertain how this kind of a structure will facilitate that. Where do I go if I want to discuss Nodejs? Or issues related to my city? Also, I feel like the biggest problems sites like reddit and hubski have to solve is the algorithm for determining the comment order users see. Will a comment be buried simply because it came late? Reddit does an OK job of dealing with it. How about hubski?