It can be implemented in a couple of ways, that aren't limited to the following - generated by most popular topic, most popular users, least popular topic and least popular users. Something along those lines that offers up avenues of discovery. Basically, I'm all for more routes to find subjects here on hubski, as it appears the only way to do that is by adding followers and reading their content, without performing a hashtag search - which can be complicated if you don't know the right subject terms relevant to your interests.
And if you really want web 2.0 to die, then you might as well kill off search, links, authoring, tags, extensions, and signals. :)