6:51 p.m. ET: Not all the questioning is particularly sophisticated.

Senate Commerce and Judiciary committees

Some of the questioning Mark Zuckerberg has faced has not been technically savvy, and the CEO at times has found himself explaining basic features of the social network.

Under questioning from Senator Capito, the 33-year-old had to explain the difference between deleting and deactivating user accounts, and whether Facebook takes a cut of sales of products on Facebook.

He has also repeated ad nauseum throughout the hearing that Facebook doesn't actually sell user data.