I tend to agree with other commenters. I think this is a really good piece, but I don't think these issues are lost on Yammer. The most interesting thing here

I tend to agree with other commenters. I think this is a really good piece, but I don't think these issues are lost on Yammer. The most interesting thing here for me is the articulation of the difference between the buyer (IT guys) and the users (employees). This is the central problem with enterprise software I think, and the reason that the field lags behind consumer software in innovation.