I think part of the confusion is due to the fact that you try to cover too many bases: in the tour the first thing is statistics, which implies that it's aimed at content publishers/writers that want to track metrics across social media, but then you speak about finding great content, which implies that it's more like a Google Reader kind of thing (aimed at readers).

I think you should clarify if it's for producers, readers or both. And if it's for both, simplify. Pick one, or maybe have separate pitches (like BuySellAds.com has for advertisers and publishers). Readers are interested in ranking and finding great content (what HN does), writers are interested maybe in stats, spreading their content publishing equally over time and across multiple social platforms.

You probably want to stick with the readers pitch since there are specialized tools for writers that have already significant features which are doing all of the above. For the readers pitch, don't promote too much "statistics", no content consumer wants to deal with statistics, they just want ranking that magically works. If you still want to mention the word, the best you can do is a pitch which tells people they don't have to deal with it ("magic ranking based on insightful analytic statistics that work for you transparently in the background").