Is There a Code of Ethics for Blogs and Bloggers?

These days it's getting a lot muckier if you will between what used to be just cut and dry journalism. Now there's a much proliferation of blogs and aggregating news stories has certainly changed since when it was just news wires Are there any sort of standards of ethics that say newer aggregators or bloggers do or should abide by? Yeah, well, I don't have an aggregator's, I think there's a whole different story and no one has really looked at that enough.