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By Allan Holmes, Center for Public Integrity celltowers

The setting was ornate, the subject esoteric, but the implications huge.

The crowd that filed last month into the wood-paneled room 226 in the Dirksen Senate Office Building included lawmakers, lobbyists, company executives, and a few mystery guests — a roster that reflected the enormity of the issue at hand: nothing less than control of the growing wireless market and the hundreds of billions of dollars that go with it.

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: