XKeyscore: Look for “anomalous” events

The Guardian published new information today about an NSA tool called XKeyscore that collects “nearly everything a user does on the internet”. One of the documents explains how the tool can be used to “find a cell of terrorists that has no connection to known strong-selectors” (e.g. email addresses):

“Answer: Look for anomalous events
E.g. Someone whose language is out of place for the region they are in
Someone who is using encryption
Someone searching the web for suspicious stuff”

The tool is designed to identify individuals based on the “anomalies” it detects in otherwise anonymous internet traffic. And that’s just very disturbing.