Google Plus (Google + or G+) is growing up as your friends circle in social networking. So you require more time to spend in G+. Knowing Google + Keyboard shortcuts helps you to work fast in Google Plus.
Google Plus Keyboard Short cuts
Related : Five useful Google Plus extensions for Google Chrome
Space : Scroll Down Streams
Shift + Space : Scroll Up Streams
J : Single Post Scroll Down
K : Single Post Scroll Up
Q : Jump to chat
Enter key (Return) : Open comments box & start Comment
Tab+Enter: Post comment
Tab: To scroll through comments on a post.
@ or +: mention someone in a post
Why late use this Keyboard shortcuts fastly and impress your friends.