Chatter is a new public messaging tool that allows you to send a 140 character message into the BlogHer Chatter stream. You can tell us what you're doing, ask a question, or just chatter... and of course you can reply to other BlogHer Chatters.
You can choose to view everyone's Chatter, just the Chatter of the people you follow, or just your own Chatter (in case you want to refer to something you said in the past).
When you're logged into BlogHer, you'll be able to send a chatter update from the Chatter landing page or from any page on the site by typing your 140 characters into the Chatter update box on the right side of all BlogHer.com pages.