Comparing Search Results
Since different search engines weigh different parts of their algorithms differently, they can all have similar relevancy while having significantly different search results.
Some people are quick to ask how their sites are being penalized in one search engine because they rank well in others. While many sites do get penalized for aggressive spamming techniques, most sites that do not rank well usually just fail to satisfy the specific ranking algorithm for that specific engine in question.
It is far easier to spend a good bit of time learning how to get links versus constantly tweaking pages over and over again. I do not worry much about things like keyword density. I know that Yahoo! usually likes content to be a bit more keyword rich and Google (which is spending millions of dollars to scan books) usually prefers more natural reading content.
While the on-page criteria can vary from engine to engine, the ability of off-page factors to raise your rankings is limitless. Different search engines will evaluate different links in different ways. In general, they all like links pointing to your website, especially links from authoritative sites related to your field.
Thumbshots has a cool ranking tool that shows you how sites rank in different search engines, so you can compare how well different algorithms overlap one another. Due to heavy load, this tool is not available all the time. MyriadSearch.com is another site that makes it easy to see the overlap between the major search engines.
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