This is really cool!

There's interactive maps of top media phrases with news breakdowns and
a ranking of how fast a particular site is on top of a hot topic:
http://memetracker.org/lag.html

Oh, and here's the science:

We tracked 1.6 million mainstream media sites and blogs
over a period of three months with the total of 90 million articles
and we find a set of novel and persistent temporal patterns in the
news cycle. In particular, we observe a typical lag of 2.5 hours
between the peaks of attention to a phrase in the news media and
in blogs respectively, with divergent behavior around the overall
peak and a “heartbeat”-like pattern in the handoff between news
and blogs. We also develop and analyze a mathematical model for
the kinds of temporal variation that the system exhibit

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