Here's an advertising attorney who has some pithy input on Pinterest, and PERMISSION is a pertinent concept.
"...And others have correctly pointed out that posting other people’s pictures without permission could be problematic."
"No, You Can’t Just Post Other People’s Stuff"
"For consumers, the likelihood that someone will challenge your right to content is probably low. For a business, the risks are much higher for two reasons: 1) commercial use (in other words, for business) is offered less protection; and (2) companies have deeper pockets.
If a company takes an image that belongs to someone else and pins it on a virtual pinboard, it could receive a letter from the copyright owner, accusing that business of infringing his rights. Such letters can lead to lawsuits and monetary penalties."
Attribution without ASKING is not permission.
Since Pinterest has not yet replied to my DMCA complaint, legal action may be the only recourse honorable folks have against photo thieves.
Are you running a business, promoting a business/company on Pinterest, or just hanging with your college classmates? Either way, would it be hard to "Do the right thing?"
My friend Martini invited me yesterday, and I accepted and joined Pinterest.
I fully expect to brazenly promote my business on Pinterest. Still forming a plan, but I think respect for copyright and trademark will be fundamental facets of any execution.
Yet, even on AR, we see advice given, and "Featured," that attribution in the way of a link back to a site is adequate, when it clearly does not comprise permission to use content.