Exactly. You read about things like https://en.wikipedia.org/wiki/Room_641A and you just have to wonder. That's an Internet backbone, who knows what they're capable of parsing and retaining from it. And if the capabilities existed to data warehouse the entire backbone, why not (if you're the NSA)?

Anything public on social networks including social graphs.

We fully know about that.

It's all redacted.

It's much easier to redact something than take responsibility for it.