I like that a "Like" option is now available on photos
I notice that one can comment on profile photos too - even your own - which is kinda like a caption. I just went through to "caption" my photos, since that brings another opportunity for interaction. Not sure if we would be able to delete other's comments, on our own photos, should a problem arise with inappropriate comments or something. We'll see. Lots of cool improvements happening on this site for sure!