Some Useful Google + Shortcuts

J                         Scroll down to next Google+ stream update

K                         Scroll up to previous Google+ stream update

QQ                      Pressing Q twice moves your cursor the search box in the “chat” section of Google+

Space                   Scroll down stream by regular intervals

Space + Shift        Scroll up stream by regular intervals

Enter                   When a stream update is selected Enter moves your cursor to the comment box

Enter + Tab          Submit comment

@                         @ followed by a username is used to mention someone in a post or share the post with them, you can also use +