We’re about to see Pinterest use among nonprofit organizations explode. Pinterest has a lot of potential, especially for organizations whose stories lend themselved to visual storytelling. Pinterest is a new(ish) and growing a image based social network and the newest darling of social media marketers. I’m always intrigued to see how nonprofits find creative ways to use new social media tools, but I didn’t think seriously about Pinterest’s potential for nonprofits until I read Joe Waters and…