Are blogs and journalism different?

The Knight Science Journalism Tracker's demise prompts Tabitha M. Powledge to argue that if something has an editor, it's not a blog, it's journalism: "With blogging, there’s nobody backstopping you, nobody catching your errors, nobody urging caution and double-checking — but also nobody wrecking your carefully wrought structure and POV and beautifully honed phraseology. It can be a form of high-wire work without a net." Also, Robin Williams — depressed? Or bipolar?