LONDON (Reuters) - In 2008, the congratulations came by telephone: "If you can handle eight gold medals, you can handle anything," then U.S. President George W. Bush told Michael Phelps after he swept the board at the Beijing Olympics.
It was a sign of the times that just four years later, at the so-called Twitter Games, it was via the social media site that dozens of friends, musicians, sports celebrities and even the U.S. President showered Phelps with good wishes after he became the most decorated Olympic athlete of all time.