This blog is several years old, but a couple years ago, for a couple years, it lived on Squarespace. When I moved it back here to WordPress, I wanted to preserve all the posts I had written during that two-year span so there wasn’t some weird two-year gap in content.
As a result, I have multiple versions of the same content posted to both sites. For example, I published this post on my old site:
And now it’s syndicated on this site:
Google doesn’t like this and will penalize both sites in search rankings—unless there’s an HTML tag that tells Google which blog post is the original.
That tag is called rel=canonical.
All you have to do to use it is add some code in the syndicated post’s HTML header section that says:
<link rel="canonical" href="http://youroriginalblogposthere.com">
That tells Google that the syndicated post is syndicated and that all search traffic should be directed back toward the original.
(Note: I use the Thesis WordPress theme on this site, so I end up just having to paste the original URL into a box in my New Post composer screen.)
If you’re curious about some of the more technical aspects of this and why it’s necessary, check out this post from Neil Patel, which I found while researching how to syndicate my posts properly. You can also read Google’s rel=canonical page if you want the official explanation.