In 2001 the FBI asked major phone companies to analyze phone call patterns in the US, for 'communities of interest'. Verizon said no, AT&T said yes. They modified their existing C programming language into a variant called Hancock. Apparently it is able to handle the massive amount of date more easily and efficiently.
Freedom to Tinker » Blog Archive » AT&T Explains Guilt by Association Quote:
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They use high-tech data-mining algorithms to scan through the huge daily logs of every call made on the AT&T network; then they use sophisticated algorithms to analyze the connections between phone numbers: who is talking to whom?
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So what does this mean? Means that AT&T will probably catch you if you're doing sneaky stuff on their network. Terrorist type of sneaky stuff.