The whole history of Google is trying to find algorithms that encode our philosophy and mental model of what we think users want. We've been discussing algorithmic changes with people online since 2001, when GoogleGuy would show up on webmasterworld.com to dispel misconceptions.

This algorithm change could come across as more editorial and less empirical. It's publicized as highly targeted ("slightly over 2% of queries"), responding to small tech discussion (Atwood, SO, HN, quality launch meeting), and seemingly rolled out in a short period of time. The media could easily boil this down to "a small number people felt sites they liked were under-ranked, so Google moved them up a week later."

I mention this because Google often talks publicly about being entirely algorithmic, and elements of this narrative feel human.

2% of queries is huge. If you average that across a population (which of course isn't how it's actually distributed...), a searcher could expect to run across such a query every few days.