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Google's John Mueller posted a reply on Twitter saying that if there are no links to a specific URL, then Google won't find the URL. Of course, the exception here is the fetch and submit feature and Sitemap feature. But outside of that, Google's John Mueller is saying they GoogleBot won't find a URL without there being links to it.
John wrote "If there are no links, we won't find the URL, robotted or not."
@collindaviss If there are no links, we won't find the URL, robotted or not.
— John ☆.o(≧▽≦)o.☆ (@JohnMu) March 28, 2017
There is the context. There have been studies done to see if Google would index URLs from Chrome data and the most recent one said no, Google doesn't use Chrome data to discover new URLs.
In any event, what is an SEO without links? I guess a magician?
Forum discussion at Twitter.
