Off-Site optimization technique using classified ads to point website traffic back into your site itself.
There are two main sites out there in the classified web world that really speak highly to Google and build a lot of relevance to Google and Yahoo, as well and also MSN/Bing as they move to a more dynamic platform. These two directory/classified websites, the reason I say directory is all the information on the classified websites are very well organized. You have Craigslist and then you also have Backpage.
The strong components about these websites is that you can check a website called Alexa.com and see that Craigslist is in the top 25 websites in the world, which means that if consumers are going to Craigslist at such a high rate that it makes the top 25 list, then its sure got to be a great place for the search engines to go for information. .