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MetaPhone: The NSA Three-Hop
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First paragraph of the article:

MetaPhone is a crowdsourced study of phone metadata. If you own an Android smartphone, please consider participating. In an earlier post, we reported how automated analysis of call and text activity can detect private relationships.

Does the National Security Agency have court authority to pour over your phone records? Quite possibly.

According to declassified documents, the NSA operates under a rote legal procedure for querying domestic phone metadata. The agency begins by identifying a “seed” number, with reasonable and articulable suspicion of terrorist activity. Next, the NSA has discretion to follow up to three degrees of calling separation (“hops”). The NSA is authorized to retrieve a complete set of phone records at each hop, and just one call in the past five years appears sufficient to make a hop.

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