They did not sell information to Cambridge Analytica. As stated in the page you linked, the data was scraped using a 3rd party application requiring user opt-in. Now, there was a bug that allowed the app developer to also scrape data from the friends of the actual users but that has been patched and the developer's license has been revoked as the entire ordeal was against FB's licensing agreement.
I am not a fan of Facebook but this entire thread is just filled with misinformation.
