title: Why does git:// works but git@ does not
body: <p>Why does git:// works</p>
  
  <pre><code>$ git clone git://github.com/schacon/grit.git
  Cloning into 'grit'...
  ...
  Checking connectivity... done.
  </code></pre>
  
  <p>but git@ does not</p>
  
  <pre><code>$ git clone git@github.com:schacon/grit.git mygrit
  Cloning into 'mygrit'...
  Warning: Permanently added the RSA host key for IP address '192.30.252.129' to t
  he list of known hosts.
  Permission denied (publickey).
  fatal: Could not read from remote repository.
  
  Please make sure you have the correct access rights
  and the repository exists.
  </code></pre>
  
  <p>Any help is appreciated</p>