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This article is a bit short on details.

Back in December 2016, Six4Three ("643") created a website https://www.facebooksappeconomy.com to raise awareness about Facebook's business practices.

"... Facebook started threatening to shut off friend data to companies in late 2012 unless they made extravagant, unrelated purchases in Facebook's new mobile ads product. Zuckerberg did this in order to keep Facebook's advertising business from collapsing because it had been built exclusively for desktop computers."

It has more details on what 643 is hoping to accomplish with the help of other app developers, including a timeline as well as a documentary video.

When 643 contacted Facebook to let them know about this website, Facebook threatened 643 with trademark infringement.1

1. http://digitalcommons.law.scu.edu/cgi/viewcontent.cgi?articl...