Yahoo!: The Social Search Engine

Yahoo! strives to provide the best search experience by delivering relevant results to its searchers in areas that computer algorithms simply fall short, such as opinions and personalized results. Yahoo! generates a good amount of traffic and is one of the easier search engines to manipulate. Yahoo! results factor in just about everything, but most important is the relevance to a particular search.
Critical Points of Yahoo! SEO:
On-page factors such as meta-tags, keyword density, web page text, title and description accuracy as well as its source, associated links and other unique algorithms and thousands of other variables.
Off-page factors, mainly being links, are also important in terms quality and quantity. Work with other websites and content providers to develop strong bonds between related pages.

List Search Engine