From actual usage of Yammer, have heard of many companies where it is in use but the user engagement is really low. Can anyone using it comment on any success stories or failures of using Yammer internally? What has worked and what not?
In my current company it's pretty successful; it pretty much fills the role that IRC had at my previous two jobs. I guess it's less intimidating for less-technical folks than installing an IRC client (and one less server for ops to maintain).
