Billionaire Elon Musk is already floating major changes for Twitter ' and faces major hurdles as he begins his first week as owner of the social-media platform. Twitter's new owner fired the company's board of directors and made himself the board's sole member, according to a company filing Monday with the Securities and Exchange Commission. Musk later said on Twitter that the new board setup is 'temporary,' but he didn't provide any details.

He's also testing the waters on asking users to pay for verification. A venture capitalist working with Musk tweeted a poll asking how much users would be willing to pay for the blue check mark that Twitter has historically used to verify higher-profile accounts so other users know it's really them. Musk, whose account is verified, replied, 'Interesting.' Critics have derided the mark, often granted to celebrities, politicians, business leaders and journalists, as an elite status symbol.