http://techcrunch.com/2012/01/05/after-a-breakout-2011-yammer-is-working-on-a-bi...

		nl on June 15, 2012 \| parent \| context \| favorite \| on: Yammer agrees to Microsoft's $1 billion acquisitio... http://techcrunch.com/2012/01/05/after-a-breakout-2011-yamme... says 2011 revenue was around $25 million.