As this is a place for many artists I thought you might find this article interesting. Basicly its about how pinterest covers its ass ... with yours.

http://ddkportraits.com/2012/02/why-...ration-boards/

I've posted a few maps myself but also pinned other peoples stuff and one thing I hadn't noticed was that pinterest makes a full scale copy of the image pinned. I looks like the whole idea of how pinterest works might be flawed in respect to copyright legislation.