QUESTION OF THE WEEK #93

Skyscrapers on a street of single-level houses

This Week's Question is also a quiz:

The image above captures the page-view statistics for Poplicks.com over the last 30 days. As you can see, for the first twenty days, the average number of daily page views consistently remained around 2500. Then, on February 8, the numbers suddenly skyrocketed, reaching as high as 22,500, on February 9.

What explains this jump?


(And yes, I do know the answer.)

--Junichi