Expect him to address Facebook's privacy policies, the Cambridge Analytica fiasco that ensnared the data of 87 million users, and Russia's repeated, ongoing efforts to use the platform to disrupt US democracy. And that's just for starters. Here's how to watch.

Zuckberg's testimony will take place in two chunks. Tuesday, he'll sit before before a joint hearing of the Senate Judiciary and Senate Commerce, Science, and Transportation committees, scheduled to start at 2:15 pm EDT. On Wednesday, the House Energy and Commerce Committee gets a turn, kicking off at 10 am EDT.