If you recall, Adobe a few years back vowed to wind down support for the embattled Flash software platform at the end of 2020 in favor of more open standards like HTML5. As a result, Facebook will stop supporting Flash-based games after December 31, 2020.
https://www.techspot.com/news/86907-farmville-11-year-run-facebook-ends-december-31.html?utm_source=dlvr.it&utm_medium=blogger
https://www.techspot.com/news/86907-farmville-11-year-run-facebook-ends-december-31.html?utm_source=dlvr.it&utm_medium=blogger