No they said twitter not HN. Hmm. Maybe this might be more applicable technology than just Twitter. Kind of like in TV-world the only smartphone is the iPhone maybe in TV-world the only online discussion area is officially twitter.

Oh and edited to add that the use of twitter, as far as I know, is a power law distribution where the higher the usage, the smaller the number of people, much like the distribution of internet bandwidth use over subscribers. So requiring 200 tweets means you've already split into a tiny fraction of humanity, so claiming you can analyze a tiny fraction of humanity does not equal analyzing humanity in general.