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People would be really shocked if they knew just how powerful this technology is. When they say it is "like Google" they mean like Google if Google had the resources available to the NSA, and those resources make the entire Google server farm look like a toy.
Almost no one remembers Perry Fellwock who was the first, and pretty much only, NSA operative to come forward with the truth. And the Truth as he told Ramparts magazine back in 1972 (http://jya.com/nsa-elint.htm) is that NSA has been spying on Americans since the 70's and even earlier. Even at that time they were able to monitor all transatlantic phone calls, cables, and telex's for key words, voiceprints and telephone numbers of interest.
There is nothing new about any of this, except that now, thanks to the power of the computer, their power has grown exponentially. If I type Mr. Uxelpilg in this post and then Google it later, this post will come up. That's in Google; if NSA makes the same inquiry they could link it to me, and then my emails, web pages visited, bank accounts, anything, everything. Some people think that is a good thing, those people are credulous and trusting sheep, who will suspect nothing until the day comes when Obama/McCain/Bush (same gang, no difference) invokes NSPD 51 and the ersatz "national emergency" is declared and the roundups begin. Of course those sheep will in fact have nothing to worry about, (except for those pesky "false positives") -- it will be the leader types who are rounded up and sent to the FEMA detention facilties. The pathetic cowards who defend their oligarchical overlords will be left alone to live their miserable fear driven lives.
To read more on the power of data mining have a look at this article by a data miner at Kos... http://www.dailykos.com/story/2006/5/16/13030/3804
As for the pending "investigation"... well that's the best laugh I have had all morning, as Glenn Greenwald demonstrated recently, the entire apparatus of the Democrat party is complicit in the worst excesses of the Buhs/Cheney regime. There may be an "investigation", but like the many others that proceeded it -- there will be no indictments. In fact, I can sum it up now, just a bit ahead of time. Here it is:
"The Congressional Report on Crimes, Misdemeanors, and certain incidents in the Buhs White House"9/11. Terror. Nothing to see here, move along please... Terror. 9/11