Of course they don't know technology. You're right that they shouldn't have been the ones asking him questions and it was the wrong format. That type of hearing is more towards trying to ensure each representative gets their questions asked, rather than trying to route out the truth.

We did learn that Mark Zuckerburg doesn't seem to have anything to do with Facebook's daily operations though, or he was outright lying. He claimed ignorance of various things that he should know as CEO, including Facebook's cross-site tracking.

I don't really see the point of these hearing TBH, but they are a novelty. We get to see his responses to various stupid questions about Facebook and the various shit they pull.