Here are a few of the most interesting Yammer statistics and facts I was able to dig up including user counts. As always, be sure to check back in the future as I will be updating this post as new and updated stats become available.
What is Yammer?
Yammer is available with Office 365, and together they form the core of Microsoft’s vision for Enterprise Social: to enable companies to work like a network. By connecting individuals to a dynamic network of people and information, we help companies listen, adapt, and grow in new ways, enabling them to better understand their customers, respond faster together, and deliver innovative products and personalized experiences. (source)
Yammer User Count
Yammer user count:
Last updated 6/25/13