Facebook has been selling your data to ad companies since the day you created your account. This only changes what you visually see on the website. It makes absolutely zero difference from a data collection standpoint. Just consent so you can delete your accounts with less hassle. Filing GDPR complaints through email is a pain, takes a long time, and has no guarantee that they’ll actually accept it. Plus, some sites (likely including Facebook) will ask for a government ID to verify you live in an area where the GDPR applies. It isn’t worth the trouble when there are easier methods. Once you’re able to log in, you should be able to access a GDPR portal somewhere in case you still want to file a report before deleting your account, but it’s up to you if you want to go through the trouble. At the very least that saves you from having to write a letter and either email or mail it to them. With Facebook’s consistent history of violating GDPR, I honestly don’t even feel like it’s worth it to try. Chances are that your data will still be sold regardless. Just look at all the lawsuits against Facebook for GDPR violations in the past years.