From Flowing data:

http://flowingdata.com/2009/10/05/facebook-measures-happiness-in-status-updates/

Does anyone have a link to the original report?

I really wish I had more of a window into the methodology of this one!

A couple of questions:

What is happiness?

How can it be measured or signaled? What kinds of data are representing happiness? Is this just an expanded or open ended sentiment analysis? Is the technology such that this would be a valid study?

Are Facebook statuses a sensible place to investigate happiness?

What is this study representing? Constituting? Perpetuating?

Edited to Add: http://blog.facebook.com/blog.php?post=150162112130