graeme_p - 5:15 am on Aug 18, 2013 (gmt 0)
No, because its all Google services, not just search.
It was also only for two minutes, so some people would have just tried again - notice the spike after the dip?
I was wrong about YouTube because, look at the original article:
The drop was in page views per minute, not data volume.
I wonder how meaningful a measure it is given how many busy sites have infinite scroll and other AJAX elements.