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Most people believe that if you are ranking well with Google, you must be doing well with Bing and Yahoo, but that is just not the caseHowever, I believe that it is important to optimize for all three-- you could be missing out on some great business opportunities if you are not optimized correctly for each of these search engines.
Bing/Yahoo & Google SEO SimilaritiesBing/Yahoo & Google SEO Differences
Bing/Yahoo and Google have both subtle and notable differences in the way they evaluate websites. Here's an outline of each (with facts taken from Google and Bing, respectively):
As you can see, Bing, Yahoo and Google all play a very important role in SEO and it is important to optimize for all. Just because you are ranking well in one search engine, does not mean you are ranking well in others.
A little over a year ago, in November, Google launched the mobile-friendly label on mobile search results. This label is grey wording that is placed underneath the link that tells the user whether the website is going to work correctly on their mobile device or not. Starting on April 21st, 2015, Google has announced that they will be adding a ranking factor that will help mobile-friendly websites rank better in mobile search, so it is very important that website owners be prepared for this change.
Although Yahoo has not yet taken on any of these traits, Bing has quietly added the Mobile-friendly label in their mobile search results, just like Google has. Currently, it is unclear as to whether or not Bing will be introducing this ranking factor for their algorithm. In November, Bing did reveal some mobile friendly techniques that they may or may not use in the future. From what I see, it seems as though there will be more to come from Bing around mobile SEO.