Long long time SEO forums member, Nintendo, posted a thread at DigitalPoint Forums a couple days ago which revealed the work of a spammer. Soon after, a blogger posted the step by step guide on how this spammer got billions of pages indexed within Google all within eight days. Here is the summarized guide;
(1) Register a domain name (could be new) (2) Set up server to manage domain and subdomains and subsubdomains (3) Buy article databases (4) Develop a content scraper script (5) Create a blog comment spam script and set it loose (6) Wait about eight days
After the story got Digged, the site has been delisted at Google.
Some quotes for you from Ammon Johns;
Is Google broken? No. Go back just 6-7 years and these pages would not have surprised you - spammy redirecting doorway pages like these were everywhere. You expected to see some of these in virtually any SERP before Google. The fact that so many people are shocked and amazed at these is itself testament to how far the search engine algorithms have come.
The real black hats practitioners regard work like this as amatuerish and foolish. It closed another loophole, rather than continued to quietly use it.