Look! No huge infringement potential!
Still only in beta and by invitation only, Ebay presents Setify, an image collection platform that is not based on copyright infringement - yes it can be done.
At this time, Setify is restricted to rare comics and coins. You can tag "items you own, or want to add to your collection." There is a social component: "Show off your collection to your friends in the eBay community."
Most artists will be happy not to have to add a "i-cant-get-no-setifytion" meta tag.
There always have been ways to share images without copyright infringement. Too bad Pinterest chose such an unfortunate business model.