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Yammer
September 10, 2008 1:04 amCheck out Yammer. It's like twitter, but focused around "what are you working on?", instead of "what are you doing?". In a nutshell, you signup and validate the domain of your work email address by confirming your email.
For example. I work for Sears Holdings and have a Sears Holdings email address. Other people who register with their Sears Holdings email addresses can see my updates, and I can only see updates from other Sears Holdings people who signup. Additionally you can pick and choose who you want to follow inside the company..
Oh yeah.. they also have an adobe air app which makes it easier to use.