And that's a wrap!

And that's a wrap on the hearing.

Sandberg and Dorsey faced deliberate questions from representatives on a range of key technical, policy and philosophical issues, logging several important answers for the record.

Perhaps the hearing's most important accomplishment was showcasing to the public the growing contrition by the social media companies and the desire to collaborate with other groups as well as their fellow tech companies. And over and over again, they expressed remorse and acknowledged they hadn’t done enough to stop foreign influence operations, and begged for government and third party “tips” to spot more.

But fundamentally the platforms remain committed to their idea of being neutral platforms who do not arbitrate truth, they simply decide whether “information” is more or less visible. When asked to take a stand on WikiLeaks and Julian Assange, who have been identified as hostile non-state actors, both Sandberg and Dorsey said the accounts haven't been removed because they don’t violate the companies' policies.

Though American-born and benefiting from U.S. free speech and telecommunications laws, the companies now exist on a global level that can in some ways surpass the reach of the elected representatives from its country of origin.

Dorsey is headed over to the House Committee on Energy and Commerce, where he will almost inevitably face questions about perceived liberal bias at Twitter.

Google could face some blowback over its no show. Many senators seemed legitimately angry that the company had not sent a senior executive.

Thanks for joining us!