As I write this, Ms Cantwell starts her questioning and it is a markedly different style. Interesting
but, isn't that pretty much always true about Congressional hearings?
it seems like they're just a platform for Senators and Congressional reps to get some high profile air time and maybe enhance their reputation amongst their voters.
and maybe, if they're lucky, some YouTuber will excerpt their "performance" and title it "Watch Senator XYZ DESTROY Mark Zuckerberg!!!"
It answers by exception; specifically, the answer is “Yes, except for information consisting of content posted by that user or other users, which is owned by the user who posted it.” I don't think the answer was at all unclear.
It's obviously couches in a way which directs the attention of the inattentive to the most user friendly component of that answer because it's the only explicit part, but minimizing the PR fallout is literally Zuckerberg’s job, so expecting him not to anything less than the maximum he can in that regard without lying to Congress is expecting nonfeasance on his part.