If no answer is given, have the next questioner ask the same question again.
At some point, that's going to get under even Zuckerberg's skin.
If a CEO can't answer a question posed by Congress, running out the clock shouldn't be a viable strategy.
"Mr. Zuckerberg, I don't feel you answered my colleague's point. Let me ask again..."
Why do the American people care about the next question, if the previous question wasn't answered? Which is more important, more questions or answers?
That quote is exactly what I mean by passive aggressive cloaking actually. You won't get the answers you want if the questioning process is adversarial as it turns into "Don't talk to the police." or deposition style of being unhelpful as possible instead of trying to actually inform because of incentives.
Zuckerberg isn't dumb. If he's repeating rote memorized passages, it's specifically to run the clock down.