Well that was one thing that stuck out for me too, what happens to copyright after death? For novels and music, and I think even films/screenplays, I "heard" that it was 75 years after death of the originator (hence anyone can play Mozart freely as much as they want, but not The Beatles). Does that also apply to images? I'd presume that I'm not allowed to sell prints of Ansell's work for profit?
But the difference between the BBC using an image or me sharing it on bookface is that I'm not using it for a commercial use. The Beeb may be technically 'non-profit', but it's still 'commercial'.
The 'intended to be viewed publically' line makes sense to me though: if I post something on bookface and set privacy to 'anyone', then 'anyone' can share said photo all around the internets for all I care. If, however, I share something and set it to 'friends only', then only my friends can see it and they can't share it within that platform. If one of them then takes said image, downloads it to their filesystem, re-uploads it to bookface or facespace, or nitwit or wherever, then that's them pretending to be the author and going against my wishes of 'friends only', that's the illegal part.
Actually, I'd say the most contentious bit is the 'is it impossible to find the original author?' bit, that's the kind of line that keeps lawyers employed.