The NSA is almost certainly engaging in full-take domestic content collection on everyone—including US citizens. If I had to guess, they're probably staying within the letter of the law while doing so via a combination of legal maneuvering and secret authorizations.
Consider Tim Clemente's on-air remarks, and the fact NSA has been been playing semantics games with the definition of "collection" such as to conflate it with the act of accessing information that's already present in storage.[0]
Also consider that Russ Tice has stated multiple times that full-take domestic content collection was occurring as recently as 2013.[1]
Moreover, what Snowden leaked was primarily from JWICS, which is arguably a glorified PowerPoint repository for the intelligence community. There are more sensitive networks, and it stands to reason that the lurid details of full-take domestic collection would probably be heavily compartmented, not floating around in clear unambiguous form on something like JWICS.
The whole metadata discussion is a bullshit facade. NSA is essentially offering up deprecated programs and their associated policy frameworks for sacrifice on the political altar. This serves to protect their current programs via way of misdirection, providing an illusion of reform.
[0] http://blog.rubbingalcoholic.com/post/52913031241/its-not-ju...
[1] 9:49, 1:13:29 @ http://www.boilingfrogspost.com/wp-content/uploads/BF.0112.T...