A Princeton University study says Facebook could lose 80% of its users by 2017, and the social network has responded, using a similar methodological approach to forecast Princeton's demise by the year 2021. The counter-study isn't a serious prediction, but is intended to highlight flaws in the original study's logic. "As data scientists, we wanted to give a fun reminder that not all research is created equal -- and some methods of analysis lead to pretty crazy conclusions," Facebook's Mike Develin wrote.

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