Not a Fan.
I dunno how facebook is saving their disks. Maybe their cold storage is really cold. I don't live in its cold storage.Well, facebook considers bluray disks for cold storage.
As per the table, DVD-R have life of 20 to 50 years. And BD-R have 5 to 10 years.
But in my real world experience, even the branded disks like slowly-burnt-Sonys have become unreadable in just a decade. I have less faith on BD-R.