Totally wrong location for a discussion like that.
Where must this be located? Moving this from Marketplace > Currency exchange to Altcoin discussion after all this involves Libra.
We will witness this, it's inevitable. Those exchanges which are going for large cooperation with Facebook and their Libra project will probably add such feature. Facebook is a supreme champion in gaining personal data of their users, data which could be very useful also for cryptocurrencies exchanges. And furthermore, it will have an impact on adaption of cryptocurrencies - Facebook is going to play a huge role here and personally I'm not happy with it.
We have no problem with adoption, its the privacy that is going to matter most in the future.
And I think bitcointalk forum might just lose audience too. Right now there are bounty hunters earning here but if facebook libra runs later on, we might be seeing more crypto ads running on facebook than here in bitcointalk.