Vanity metrics: good for feeling awesome, bad for action. (photo source: UK Guardian) This is a guest post by serial entrepreneur Eric Ries. He was most recently co-founder and CTO of IMVU, which has more than 20 million registered users and generates $1,000,000+ in revenue per month. Eric is also a venture advisor to Kleiner Perkins. How do you get to $1,000,000 per month in sales? By testing the