A few did mention net neutrality and sex trafficking, but it was mostly (if not completely) patting themselves on the back for their part in stop government overreach for the former, and protecting the vulnerable / punishing bad actors in the latter. I'm just adding this to fill you in.
The part that I found odd in terms of topics were the questions about:
(1) apparent bias against conservatives from some Facebook-employed moderators because of incorrect or delayed actions taken.
(2) the idea that Obama campaign "did the same thing".
(3) Facebook allowing ads from allegedly illegal pharmacies in the wake of the opioid crisis.
I'd actually go as far as to say that around 20% of the questions that the Senate and the House asked were unrelated to the events surrounding Facebook and their relationship with Cambridge Analytica.