They have to text you the details outside of Facebook, or alternatively, have to adopt a new platform because of you.
Of course I still think you should delete Facebook. With all this recent controversy they had a chance to right the wrong, instead they chose to double down on exploiting their user base - not only in the legal department but also by quickly running their facial recognition stuff before the GDPR goes into effect.
On the plus side, the more people leave, the less Facebook will lose its justification because right now, the sole reason to be on Facebook is that it’s where everyone is.