loupagliaTC50: Twitter-for-business startup Yammer wins TechCrunch50, I may eat my hat
The fundamental issue I see with Yammer after using it today is the fundamental issue that many enterprises have with enterprise software: end users in the enterprise don't want to use two different tools for this type of interaction. Do users now have to decide each time they want to type what they are doing? Hmmm, am I doing something for the company right now or something ONLY people in my company care about, I need to use Yammer. I am doing something that people that both in my company and outside (or just outside) care about, then I use Twitter?
Many enterprise software applications suffer from this. That is why people love Google Apps and the like rather than using Microsoft SharePoint.
