Official Gmail Blog: 5 Buzz tips - http://gmailblog.blogspot.com/2010...
Best tip: Turn on keyboard shortcuts from Settings, and use "j" or "n" to scroll down the buzz tab, "k" or "p" to go back up, "r" to comment (same shortcut as reply in Gmail), and "shift + l" to like. Hit "m" to mute a post so it won't keep showing up in your inbox. - Evan Parker
Best tip: Turn on keyboard shortcuts from Settings, and use "j" or "n" to scroll down the buzz tab, "k" or "p" to go back up, "r" to comment (same shortcut as reply in Gmail), and "shift + l" to like. Hit "m" to mute a post so it won't keep showing up in your inbox. - Evan Parker