after implementation of Google Penguin the Linkbuilding are not as effective as they were before the penguin but still gray hast or black hats will try to get through it in any way and bring some thing good in there views
Yahoo! Site Explorer was Yahoo’s free tool that let you see backlinks pointing to any provided URL. It used to top the charts for free SEO tools, best SEO tools, and many other categories for years.
Unfortunately, the service was discontinued on November 21, 2011. However, nostalgic mood over Yahoo! Site Explorer wouldn’t die off. Even in 2013, when asked what SEO software they prefer, some people still recommend Yahoo! Site Explorer