Where does the URL parameter "?chocaid=397" come from?

Posted by unor on Pro Webmasters See other posts from Pro Webmasters or by unor
Published on 2012-11-14T12:15:16Z Indexed on 2012/11/14 17:31 UTC
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url-parameters

In Google Webmaster Tools, I noticed that my front page was indexed two times:

example.com/
example.com/?chocaid=397

I know that I could fix this with the use of link type canonical, but I wonder: Where does this parameter come from?

There are various sites that have pages indexed with this very parameter/value: https://duckduckgo.com/?q=chocaid%3D397.

I looked for similarities between these sites. but couldn't find a conclusive one: It's often the front page, but not in every case. Some are NSFW, but not all. When one domains' URL has this parameter, often other subdomains of the same domain have it, too.

Examples

Wikipedia entry

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Microsoft Codeplex

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