The list of people that want to hear from social media giants in the wake of the Cambridge Analytica scandal keeps getting longer. Senator Ron Wyden wants to know how the data collection happened in the first place, and Facebook talked to Congressional staffers last week. The FTC is investigating the whole debacle, as well. Mark Zuckerberg is predictably sorry. Now the Senate Judiciary Committee has invited the CEOs of Facebook, Google and Twitter to testify on April 10th over data privacy procedures.