What MUST (and must not) be included in posts

For any number of reasons, (not the least of which is liability), all posts must include the following information if available:

Active link to source

It should look something like this:

Here’s how to Create a Post Heading
By Servitium
May 18, 2012
Link to original

This information should be featured prominantly at the top of every post.

DO NOT VIOLATE SOURCE COPYRIGHT. If the source publication has a copyright policy that doesn’t permit posting the full article on AQ, then please post only an excerpt (perhaps a paragraph or two) and provide a link to read the rest of the article at the source.