Perhaps the Facebook link may work for people who have signed up to Facebook (I wouldn't know as I have never looked into the site), but for me and, I guess, others the link only goes to a Facebook sign in page. There are no Photos / Albums to be gone into.
This sort of thing is one reason why we prefer images to be embedded in the GMB posts or set up in the GlassGallery site, specially created for use with the GMB.