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Hello and welcome to The Download, The Australian’s technology blog for the latest tech news. Overnight in the US the chief executives of the world biggest tech companies have been appearing before congressional hearings into antitrust issues. Amazon.com’s Jeff Bezos, Apple’s Tim Cook, Facebook’s Mark Zuckerberg and Sundar Pichai, CEO of Google parent Alphabet Inc. are testifying. US president Trump has threatened to take action if Congress does not.