Recently Yahoo! announced its Content Acquisition Program. Search Engine Watch did a review of the changes.
Yahoo! is to increase the size of its search database through the use of more aggressive crawling, Site Match, and human editors looking to find ways to include portions of the hidden web.
Yahoo! recently rewrote much of the Inktomi core which will allow them to
- better process 3 and 4 word querries
- easily change the algorithm in the future
- easily turn stemming on or off
AltaVista and AllTheWeb are now using the same indexes as Yahoo!, though they are still powered by their own algorithms.
When Yahoo! reviews a site for Site Match they store data that the page has been quality reviewed. These sites may receive a ranking boost for being reviewed. This move alone would make paid inclusion seem exceptionally biased. Yahoo! is offsetting this by randomly reviewing other sites in its index.
Many people are concerned as to how this website review boost will effect the purity of the index, but any bonus that may be given will not be too large or Yahoo! would earn a bad reputation and a bunch of negative press in a time period where they are trying to aggressively expand their distribution.
Yahoo! believes they can offset some of their additional charges by opperating more transparently with webmasters when issues related to search come up.
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