> John Cannarella and Joshua Spechler, from the US university's mechanical and aerospace engineering department, have based their prediction on the number of times Facebook is typed into Google as a search term. The charts produced by the Google Trends service show Facebook searches peaked in December 2012 and have since begun to trail off.

Well, yeah... The more people are already familiar with facebook, the less they will be googling/researching it. If anything, considering the popularity of Facebook at the time, it should have been seen as a sign of vitality.

I'm pretty disappointed that the Princeton researchers were so blinded by googlinums that they forget those googlinums don't exist in a vacuum. Probably why mechanical and aerospace engineers aren't fit to make predictions of a social nature (among other engineers, too, sadly).