Twitter silences some verified accounts after wave of hacks

A series of high-profile Twitteraccounts were hijacked on Wednesday, with some of the platform's top voices - including U.S. presidential candidate Joe Biden, reality television show star Kim Kardashian, former U.S. President Barack Obama, billionaire Elon Musk, and rapper Kanye West, among many others - used to solicit digital currency.The cause of the breach was not immediately clear and - more than an hour after the first wave of hacks - Twitter took the extraordinary step of preventing at le