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We supplement this free crawl with the paid inclusion program, which allows us to add dynamic database content and other content that we could not otherwise discover and crawl. Currently less than 1% of our index is content that is included via our inclusion programs.
Our paid inclusion programs provide a superior way for sites to interact with us in a clearly structured fashion. These sites get the following
1) Control over which URLs they include in the index (subject to content
2) Frequent refresh
3) Clearly defined way to interact with us (for example: clear feed
4) Quality review and consultation (for feed customers)
5) Detailed reporting to track and optimize performance
6) Customer service
Participation in Yahoo!'s paid inclusion program does not guarantee rank in the search results. URLs are ranked in search results in the same way as all other URLs from the free crawl. The key drivers of ranking are keyword-specific relevance and site quality, as assessed by our regular search relevance algorithms with input from the quality review process.
(Note that Inktomi Index Connect clients are receiving Yahoo! Search traffic going forward, and Inktomi Search Submit customers are receiving a free trial of Yahoo! traffic until 4/15/04.)
We will also be launching free URL submission during the week of 3/1. This service allows content providers to suggest that the crawler should visit a site during the main crawl cycle. This service is different than paid inclusion in two ways:
1) There is no guarantee that we will crawl and include the URL in the index.
2) As this site potentially could be added to the main crawl, Yahoo! Slurp will follow links from that URL.
This service will reside on the Yahoo.com site and be accessible via a Yahoo! login. This service has been available for the AltaVista and Alltheweb Indices previously and the tradition will continue with Yahoo! Search.