Instragram reverses it's decision to use their users images for their own advertising. While I think this is a temporary win for all of us, I think it's only a matter of time before Facebook, Blogs, etc. try and utilize our artwork for their gain. Be smart and watermark your images, so if they do use them, you get the credit you deserve...
http://blog.instagram.com/post/38252135408/thank-you-and-were-listening