Clamor about Yammer: In-house micro-blog can unite far-flung staffers Twitter-esque service helps businesses foster collaboration across the nation — even around the globe. By Lindsey MillerMay 7, 2009 SHARE To read the full story, log in. Become a Ragan Insider member to read this article and all other archived content. Sign up today Already a member? Log in here. Learn more about Ragan Insider.