It's been estimated that FarceBook's current revenue could be replaced by charging each user US$5-10 a month.
https://www.washingtonpost.com/news/the-switch/wp/2018/04/05/what-if-we-paid-for-facebook-instead-of-letting-it-spy-on-us-for-free/
But I suspect that what FB costs to operate and even make a modest surplus is much less than that. One question that intrigues me is this; would a FB-a-like cost more in less to operate, in aggregate, if we replaced it with a federated platform?
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