New Celebrity Twitter Directory bookazine rates the best and worst of the world’s most famous blogs Cycling legend Lance Armstrong has been rated as one of the best celebrity users of social media sensation Twitter in a new guide to the website, The Celebrity Twitter Directory. Former Knight Rider star and current judge on America’s Got Talent, David Hasselhoff, however, was voted as one of the worst, along with rap star Eminem, pop icon Janet Jackson, X-Man ...