4/ The match is never perfect, but when combined with other data, can be suggestive.
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Also what do they get from VPNs and any Tor exit notes that want to play along as PRISM providers, but that's another issue.
Thanks. Twitter will use this to make your timeline better. UndoUndo
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Tor entry/exit nodes are maintained by independent people all over the world, so there's not "upstream" location.
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Why not their IP?
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There's no one place, or even thousands of places, the NSA can tap in to see all Internet traffic.
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Sure but there aren't that many Tor exit nodes.
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About 6500 of them. That's a lot, even for the NSA. http://torstatus.blutmagie.de/
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How many in US tho?
End of conversation
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