Twitter Inc said on Tuesday it had restricted Donald Trump Jr.'s ability to tweet from his account for 12 hours, after it required him to delete a post that violated the social media site's policy on coronavirus misinformation.

The eldest son of U.S. President Donald Trump posted a since-deleted tweet on Monday with a viral video of doctors talking about the drug hydroxychloroquine.

A much-anticipated congressional hearing featuring the CEOs of four of America's largest tech firms kicked off on Wednesday with lawmakers locking horns while also offering a window into their ideas about reining in Big Tech.

Facebook Inc's Mark Zuckerberg, Amazon.com Inc's Jeff Bezos, Alphabet Inc-owned Google's Sundar Pichai and Apple Inc's Tim Cook - whose companies together represent about $5 trillion of market value - appeared via videoconference before the House Judiciary Committee's antitrust panel.