There are two sides to this.
Is using a go-pro in the FD on a suction mount a legal problem? Most likely not. And as long as you don't use wifi remote to trigger it, Airbus have no issues.
As for putting it on social media, well maybe as we age and look down despairingly over our reading glasses as the spiky haired tech attached youth, we need to acknowledge that there is a generation gap.
I have many hours of GoPro footage from landings in some interesting parts on the planet, that are on a locked private Vimeo account. Access is family only - or others on request (which has included Airbus!) .