A microblogging, social network, discussion board and knowledge base service intended for businesses. Launched in late 2008, Yammer networks are created for organizational use with everyone using the same company e-mail address. Private groups within the company can also be organized. Access is available via a desktop application, the Web, e-mail, instant and text messaging, as well as iPhone and Blackberry smartphones. For more information, visit www.yammer.com. See Twitter.