Read this Twitter thread. Someone de-activated their Facebook account in late 2016 and downloaded their data.  Today, she downloaded the archive again and found 400 megabytes more data in it. Even though her account had been de-activated the entire time!
Facebook continues to track your online web activities and your offline activities  including buying your retail store purchase history from third party data aggregators.
Facebook is a giant vacuum that sucks up every bit of data it can and is why we must plan on delete our accounts from Facebook.
Facebook is not your friend – in fact, as their data is often used against us, Facebook is our enemy. Facebook must be shut down. Zuckerberg and Sandberg are snake oil sales people, scammers, fraudsters and liars.