Yammer is opening up its microbogging platform. In "Yammer Community" people may now create a community without the requirement that an email address be associated with a particular domain.
"Socializing doesn’t scale. Once a group reaches a certain size, each participant starts to feel anonymous again, and the person they’re following — who once seemed proximal, like a friend — now seems larger than life and remote." And that's why we don't want to run a University-wide Tornado server
A US study (http://pewinternet.org/Reports/2010/Social-Media-and-Young-Adults.aspx) has indicated that younger internet users are losing interest in blogging and switching to shorter and more mobile forms of communication. The number of 12 to 17-year-olds in the US who blog has halved to 14% since 2006, according to a survey for the Pew Internet and American Life Project.