Yahoo! As of April 2017, it is a search engine accounting for 11.7% of US search share. That’s why you shouldn’t ignore it. 1 in 10 people use it every day.
It’s important to recognize the difference between SEO for Google and SEO for Yahoo!
Just because Google is competitive doesn’t mean it’s competitive at Yahoo!
Google’s SEO is arguably more complex than that of other search engines. According to some theories, this means SEO on Yahoo!
Yahoo SEO is like Bing. So, optimizing for Yahoo! is optimizing for Bing. Although both search engines have their own algorithms, an automatic system that determines how to rank a website for a given word or phrase, they are very similar to each other.
Yahoo values inbound links and backlinks more than Google does. This means that if you have a lot of quality links on your website, you can rank very high on Yahoo, even if other factors that Google prioritizes aren’t in a place where they should be.
Yahoo takes domain age very seriously, i.e. how long a URL or address is associated with a website. So the older the domain the better.
You can’t make a domain older, but be careful when rebranding. Don’t change your domain name to get a high ranking on Yahoo!
Yahoo uses the Bing search engine as part of the Bing network. So, with Bing Webmaster Tools, you can register your site on both Bing and Yahoo, find problems and improve search performance.
This is useful when servicing countries that mainly use Yahoo search services, such as Japan and Taiwan.
In Bing Webmaster Tools, you can verify ownership, submit a sitemap, and install the plugin below, and both Bing and Yahoo will be indexed and exposed within 2 days. Please make use of it.
References: 1. Registering on I’MWEB’s Yahoo (Bing) site