Why does git:// works but git@ does not

Question

Why does git:// works

$ git clone git://github.com/schacon/grit.git
Cloning into \'grit\'...
...
Checking connectivity... done.

but git@ do

Answer 1

Your first clone method is using the git protocol, the second is using SSH.

You probably don't have your SSH token setup on github.com

https://help.github.com/articles/generating-ssh-keys

Gives you the steps on how to setup your user account for SSH use.

You can see the differences between the protocols as they pertain to github here:

https://gist.github.com/grawity/4392747