When John F. Kennedy said, “Ask not what your country can do for you; ask what you can do for your country,” the message caught fire almost as soon as he uttered it. Nearly 50 years later, Barack Obamaâ??s “call to service” has also spread far and wide, with a modern, high-tech twist. Itâ??s all over the Internet â?? at www.serve.gov, Facebook, YouTube and Twitter.