Let me translate: If you clicked a “Like” button anywhere on the Internet, then you are a Daily Active User. Even if you never go to Facebook.com.
lessismore: I am as excited about Facebook's IPO as I was about Groupon's. Legally, it is a private company, but in reality it has been a public company for a long time. It went IPO without actually inviting the general public. http://finance.fortune.cnn.com/2012/02/08/facebook-ipo-numbe...