I happened upon an article entitled "Please Pass the Scavenged Bone Stock" and discovered that there are many different opinions out there about the propriety of saving chicken bones for stock. The article reads like a polemic, but I'd like clearer answers to the following questions:
Is it safe to use leftover untouched chicken bones/carcasses for stock? How long can they have been sitting out, and what if I want to freeze them for later use?
Is it safe to salvage bones for stock if people have been eating off the bone? Is this a common practice, or is it considered "disgusting"?