[billpatrianakos]

First off, YouTube's policy is very similar to Pinterest. Besides that, they have different use cases. People aren't posting photos to Pinterest because they want to look at photos or use it as an art gallery. The purpose of Pinterest is very different from that of YouTube. It's like an inspiration folder or a brain dump where you stash things you want or that inspire you so you can look at them in the future. YouTube truly is an exhibition in the fullest sense of the word. You are going there for the value of the videos themselves, not the value assigned to them by others. It's one thing for NBC to take down all videos on YouTube of SNL because the value to NBC is in the actual watching of the videos. With photos it's a little different. Users aren't exactly "using" photos. They're simply putting them in a virtual box to look at later. If you want to go out to buy a photograph you're going to buy it to use somewhere like on a postcard or a website. Of course you need to see the photo before you buy it and once it's seen it cannot be unseen. Pinterest is putting them in a different context but they aren't exactly using them per se.

Probably not the best argument but the more important point I want to make is that this is a case where you can't use semantics to argue your way through. There are a lot of variables involved that make this a very muddy issue. Things like intent and the probability that the photos will be used for profit need to be taken into account. Just because something can happen doesn't means the odds are high that it will.

Plus copyright holders still have the DMCA and it's unlikely Pinterest won't abide.

EDIT: I just realized that the way you framed the issue puts the onus on Pinterest to police the content. It's not a bad idea that they do but with video it's far easier to spot a famous movie or tv show than it is some freelance photographer's copyrighted work. The whole point of Pinterest's policy is to put the onus on the user to make sure they don't upload things they shouldn't. That's smart and combined with copyright holders' way to complain through DMCA, I see nothing wrong here.

[zerostar07]

How is it so different use cases? I think an average user would find it very similar. Think, for example, The Oscars photos or the british wedding photos, or AP photos. The only reason it hasn't yet created a stir is because photos are cheaper. Assuming it will gain enough traction, i think pinterest at some point will start some ad revenue sharing programs like youtube.