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By Justin Elliott and Theodoric Meyer, ProPublica 

National Security Agency headquarters in Fort Meade, Md.

National Security Agency headquarters in Fort Meade, Md.

Last week saw revelations that the FBI and the National Security Agency have been collecting Americans’ phone records en masse and that the agencies have access to data from nine tech companies.

But secrecy around the programs has meant even basic questions are still unanswered. Here’s what we still don’t know:

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