I'm sure I've said it before, but I maintain that if the source of the article and the target both supported the Webmention spec, then when a piece used an image (or really any other type of media, including text) with a link, then the original source (any website, or Flickr in this case) would get a notification and could show—if they chose—the use of that media so that others in the future could see how popular (or not) these types of media are.
Has anyone in the IndieWeb community got examples of this type of attribution showing on media on their own websites? Perhaps Jeremy Keith or Kevin Marks who are photographers and long time Flickr users?
Incidentally I've also mentioned using this notification method in the past as a means of decentralizing the journal publishing industry as part of a peer-review, citation, and preprint server set up. It also could be used as part of a citation workflow in the sense of Maria Popova and Tina Roth Eisenberg's Curator's Code<sup>[1]</sup>set up, which could also benefit greatly now with Webmention support.