According to Google, 30 percent of everything online is a duplicate of something else somewhere else online.

We first read about this on Gizmodo.

On the GoogleWebmasterHelp YouTube channel engineer Matt Cutts explains how duplicate content affects a site's SEO.

It turns out that Google doesn't recognize duplicates—like blockquotes, reblogs, reposted images, etc—as spam. Instead, it groups all of the duplicated content into a single lump and attempts to surface the best of it.

As Gizmodo points out, "how Google deals with duplicated content isn't all that surprising—it's just crazy how much of the information out there is just a copy of something else."

Here's the explainer video:

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