Yammer asks: What’s Happening at Your Company?

While watching the streaming video of the TechCrunch50 (link has expired) conference yesterday, I just caught the last couple minutes of the demo for Yammer. Basically, as most people have pointed out in the TechCrunch comments, Yammer is Twitter for companies. But what really caught my eye was the way they use “hash tags” to allow you to automatically “follow” a specific…