Ask HN: Where are the Facebook Horror Stories?

I read and found value in this story a couple weeks ago - http://news.ycombinator.com/item?id=2408806 , whereas it was a wonderful tale and 'how-to' on how to make Facebook work for your start up.

I'm looking for the opposite. I remember reading some lengthy articles from folks about how FB had terrible ROI, CTR, and was generally a waste of money.

Does anyone know where any of these horror stories are?

Many thanks!