Prominent business and government figures spread rumors about the attack on Brown University's campus this month, reigniting questions about accountability in online discourse.
Shares of Tesla have hit new highs on optimism about the company's self-driving taxis. But experts say Tesla is far behind Waymo, which has a big head start.
The Trump administration said five regulators and researchers who work to tackle disinformation and abuse on the internet had been barred from entering the United States.
The administration has downplayed concerns -- from mass job losses, to a potential financial bubble -- as President Trump cheers soaring stock prices and faster growth.