For years there has been a lot of debate and controversy over the issue of duplicate content.
Five days ago, Google addressed this issue by posting a video on their Webmaster Central Blog by Greg Grothaus entitled Duplicate content and multiple site issues. Greg dispels the “Duplicate Content Penalty Myth” by essentially repeating what Google has been saying for years: there is no penalty.
( Here is a link to an eBook written over a year ago, The Duplicate Content Debate, which has a good discussion of the issues. )
Mr. Grothaus goes on to discuss examples of legitimate duplicate content, and explains that Google will try to choose the best version of the content, and display that for each search engine query. It rarely happens, but if Google decides that duplicate content is being used to manipulate rankings, it will “make appropriate adjustments”. However this is not a penalty for duplicate content — it’s a penalty for spam.
There are several issues ( not penalties ) that may result from duplicate content, even if it IS legitimate:
To prevent such issues, there is a new link element available to tell Google which of several webpages is the one you want indexed. The canonical tag may be used on duplicate pages to point to the page that you want Google to index. Using the example from the video, suppose that you want Google to ignore this URL:
http://www.example.com/page.html?sid=asdf314159265Then you would put the following in the HEAD section of that page ( IMPORTANT – This means it goes on the page(s) that you DON’T want Google to index! ):
<link rel="canonical" href="http://example.com/page.html" />So it seems that the debate over duplicate content has now been laid to rest.
Conclusion: If you’re not trying to be “black hat”, don’t worry about it — but let Google know which of your pages you want them to index.
UPDATE – September 21: I just posted a new Squidoo Lens, Duplicate Content Has No Penalty, Says Google. It is especially for people like me, who really don’t like videos, and would rather read something instead. The lens has the video, but also the slide show, with the ability to slow down the slides so there’s enough time to read them.
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