@Dan, I don't know why people are up in arms about it, either -- especially since sites like Quora and Delicious (and others, I'm sure) have the same policies.

Home sellers, that's another good one for the list.

You do point to a bigger issue, the "gray area" of Pinterest. I would argue that most of the Internet is a gray area. It's so easy to exchange information, files, music, photos, and everything else that I wonder how copyright laws are going to be affected. I think this whole Internet thing might just change the world. :)