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"...helping legislators and intelligence agencies understand how to use the social network for campaigning, reaching out to their constituencies and in their regular line of work."

Hmmm...I wonder what "regular line of work" Facebook is helping the CIA with.

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the most obvious would be large crowd behavior analysis. That would not necessarily require divulging individual information.

The other possibility would be some form of association tracking. This is not significantly different than trying to determine enemy dispositions by inspecting who communicates with whom, and at what frequency. IOW, traffic pattern analysis.

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