Behold, the Next Media Titans: Apple, Google, Facebook, Amazon: High tech and media have argued about "convergence" for a generation, and attempts to make it happen have resulted in so many business failures that few mention it anymore. Now it's clear what the problem has been: The PC will always be a lousy device to watch TV and movies on. The TV will always be a lousy device for web surfing and e-mail. Smartphones and tablets, on the other hand, are turning out to be good for all of them. And these breakthrough devices will make Apple, Google, Amazon and Facebook the news, entertainment and communications networks of the 21st century.