Does the NSA Tap That? What We Still Don't Know About Internet Surveillance

Virtually everything about National Security Agency surveillance is highly secret and we're left with far from a full picture.

• Is the NSA really sucking up everything? It's not clear.
• Is purely domestic communication being swept up in the NSA's upstream surveillance? It's not at all clear.
• Are companies still cooperating with the NSA's Internet tapping? We don't know.
• What legal authority is the NSA using for upstream surveillance? It's unclear, though it may be a 2008 law that expanded the government's surveillance powers.
• How much Internet traffic is the NSA storing? We don't know, but experts speculate it's a lot.