Facebook has its ads on the left column directly under its left menu links! And it doesn't look like an MFA site to me!
The ads are well distinguished from its main content.
1: a site with too many ads (page download time is longer than usual)
2: a site that is focused on getting ad clicks rather than focusing on providing content
3: a poor designed template with ads on the top and/or left side of its pages or blended in within the main content.
4: a site that confuses its visitors where to click.
5: a site with more ads than content/pages
[edited by: dailypress at 5:12 pm (utc) on July 5, 2008]