Yahoo! Backlink Check
Backlinks is another way of saying "links into a page". When you check backlinks in Yahoo!, ('linkdomain:www.whateversite.com'), it shows most of the known links into a site. Yahoo! has also had some trouble with 301 redirects and may show the wrong URL locations for some of the backlinks.
You can check the backlinks into your home page specifically by specifying the full URL of the home page ("link:http://www.whateversite.com/").
You can check the links pointing into any specific page on a site using their individual page link check command (link:http://www.site.com/folder/page.html). Make sure to include the "http:" part when checking links pointing into individual pages.
Yahoo! will also let you look through most of a competitors' backlinks. Their advanced search page allows you to specify a domain type as well. This makes it easy to see if they have any .gov, .edu, or other high-power backlinks that may be well trusted based upon the domain extension. You can also subtract out their internal links or links from other specific domains by adding '–site:othersite.com' in your link search query.
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