The tech industry's "Big Tobacco moment", where the bosses of four of the biggest companies - Apple, Amazon, Facebook and Google - are giving evidence to the US Congress in Washington today.
The House of Representatives' Antitrust Subcommittee is investigating whether the power, size and tactics of the four companies has crushed competition, reduced innovation and harmed consumers.
It is the first time tech's most well-known bosses have appeared together in front of a committee and their performance could well decide whether US politicians decide to introduce new laws curbing Big Tech's power.
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