This is that 2014 Princeton paper (mentioned in Guardian, et. al,) where it uses an infectious recovery "SIR" model to predict Facebook's decline by 2017. It has charts that overlay FB with the same fate MySpace succumbed to 5 years ago. (Charts are on pages 9-10). User mvoccaus, in the DataIsBeautiful subreddit, 09 Sep 2016
Using epidemiology to predict Facebook's decline [PDF] User not-a-ginger, in the Health Data subreddit, 23 Jan 2014
Facebook will lose 80% of its users within a few years, according to a new mathematical model based on MySpace data. (from /u/wil3) User raddit-bot, in the TechUK: technology news and discussion without the American focus subreddit, 22 Jan 2014
Modelling the spread of social networks as a disease User Scientologist2a, in the FoodForThought: Intellectual Nourishment subreddit, 22 Jan 2014
Facebook will lose 80% of its users within a few years, according to a new mathematical model based on MySpace data User nastratin, in the math subreddit, 22 Jan 2014
Facebook will lose 80% of its users within a few years, according to a new mathematical model based on MySpace data. User RealtechPostBot, in the realtech subreddit, 22 Jan 2014
Facebook will lose 80% of its users within a few years, according to a new mathematical model based on MySpace data. User wil3, in the /r/Technology subreddit, 22 Jan 2014
Researchers apply epidemiological modeling to adoption/reversion rates of social media; find Facebook users will drop drastically by 2017 User TheRedWhale, in the Reddit Science subreddit, 22 Jan 2014