Guidelines Module NoFollow URL 
Adam Sherk
MAY 14, 2013
You’d be surprised at how many existing links (both internal and external) may be pointing to incorrect or discontinued URLs. A good way to investigate this is to review the Crawl Errors report in Google Webmaster Tools, which shows URLs with 404, 500 and other errors that Google encountered while crawling the site.
Kikolani
DECEMBER 8, 2015
Every web portal has to abide by Google’s webmaster guidelines to reach amongst the top ranking in search engine results. Social networking website URL if any. By documenting data you need not refer to various social networking websites every time you need an URL. Contact e-mail address. Website contact form.
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