I'm really sad about G+ going away as well, Cherie and agree I loved the format and the accessibility to Google searches after posting.
A BIG NO from me on Flickr buttons for sharing cards. People go to Flickr to pull images for using and my cards are not for use to others.
Tumbler is really the only other one out there, although sales don't come from there much.
No from me on any blog sites as they all have different ways of posting images and the best tool we have at the moment is the link with our affiliate code built in - that's what you should be using on an blog posts.
I think we'll have to wait and see what the future holds. Maybe even better.