Interesting post on the Yammer blog on how Yammer used its own social software to create a  university for new starters – an external Yammer network where people could get up to speed with working at the company:

With YammerVersity, we have created a private and secure environment for new hires to begin navigating Yammer, learning the company culture and completing their training. We are able to invite new hires into this separate external network, YammerVersity, prior to their start date so that they could start to casually internalize Yammer culture.

The approach is interesting in that it is all about: