WATCH LIVE: Lawmakers to question the CEOs of Apple, Google, Facebook, and Amazon (AAPL, GOOG, FB, AMZN)

· The CEOs of Apple, Amazon, Facebook, and Google's parent company Alphabet are all testifying today before the US House of Representatives' Antitrust Subcommittee.
· It's extremely rare for one of the tech giants' CEOs to testify before Congress, let alone all four. The historic testimony comes as the subcommittee nears the...