Google’s Matt Cutts posted a twenty minute video summarizing two presentations he gave last year. The video goes over what he considers to be virtual “blight,” or when a site or community becomes stale with spam. In addition, Matt shows us how to put on a “blackhat” and think like a spammer.
The video is pretty interesting to all levels of SEOs, so I embedded it below. In short, he summarized the three types of blight, including link spam, open landing pages and hacking. He then goes into how to think like a blackhat, in the “blackhat mindset” segment.
He also cross posted this video and presentation at the Google Webmaster Central blog.