Senator Kamala Harris had some rather confusing questions at Wednesday's hearing, suggesting she isn't exactly well-versed as to how Facebook advertising works. But overall, senators on this committee appear to have a much better grasp on the issues than their colleagues who questioned Mark Zuckerberg in April.

After those hearings, many lawmakers were mocked online for their apparent lack of understanding of how social media works. (See: Senate fails its Zuckerberg test)

It makes sense, since the Senate Intelligence committee has, for more than a year, been leading the congressional investigation into the use of social media platforms by Russians to influence the 2016 U.S. presidential election.