The rumor mill has been buzzing for months about the imminent arrival of a new “Facebook browser” called RockMelt.

Well, it really does exist, and it’s here. RockMelt is being released as a limited public beta Sunday. Anyone can sign up to test it out, but the release will be

Think of all the giant technology companies that have changed your life, and the chances are that they’re American. Facebook, Google, Twitter, Apple, Microsoft — there’s something about the U.S. digital economy (not least piles of Silicon Valley