They didn't collaborate with CA, they just had gaping security holes in their API that allowed CA (or anyone) to easily grab tons of data on people's friends. FB patched those holes up right away when they found out, not because they were concerned with what CA was doing, but because CA did all this without paying them for targeted advertising.
Friendica
Overview:
All things about the Facebook alternative Friendica that began in 2010. Often called the fedi swiss army knife as it comes with many features.
Currently Android and Sailfish have apps.
🟡Recommended Instances:
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🇨🇦 Canada: onjase.quebec
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🇩🇪 Germany: piratenpartei.social
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🇫🇷 Largely French: social.trom.tf
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🇮🇹 Italy: poliverso.org
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🇵🇱 Poland: soc.citizen4.eu
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🇦🇹 Austria: friendica.io
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🌍 World: friendica.world
🔵Related:
💰Buying and Selling:
!flohmarkt@lemmy.ca
💬Messager:
!matrix@programming.dev
📷Instagram:
!pixelfed@lemmy.world
🚫Boycott Facebook:
!demeta@programming.dev
👀Privacy:
!privacy@lemmy.dbzer0.com
❗️Status:
!friendicaworld@lemmy.world
Don't forget Trump used it also
And how it helped get the russian lovin pedo elected in 2016: https://www.nbcnews.com/news/us-news/cambridge-analytica-harvested-data-millions-unsuspecting-facebook-users-n857591