Recently, yahoo's spider crawled the search engine and changed many website's ranking. What's the reason behind this is that Yahoo now following the same strategy which was done by Google one year back.
Yahoo has one difference in changing the algorith is that algorithm valued only Paid advertisement through which yahoo can get more and more revenue from advertisers.
1) Less appearance of Website with Money Keyword in Natural Listings.
2) Top 10 website are not much related to keywords.
3) More money keywords website will be appeared on ads (on left hand side of search engine)
4)Main intention is to acquiring the more clicks on ads.
5)Money Keyword such as " Buy, Order, Purchase" will appear less in natural listing (top 10).
6) Crawling and Updating time has been increased (Approx 90 days)
One year back Google did the same but Google also valued those websites which were coming through organic results along with adword results.