[walexander]

There's nothing particularly unexpected by this, is there?

You see a big spike for "NSA" and "Prism" initially, then "Snowden" gradually takes over.

People consuming information about the NSA leak learned everything available during the first week. There is nothing new to be learned there.

Snowden's whereabouts are, however, an ongoing saga. As a result, I, like many others interested in this, are searching for Snowden news which is constantly changing.

It's encouraging so many are searching for Snowden. No one would be interested if they didn't already understand the context.