Document.referrer Is that harmful to my website?
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Someone (maybe my Competitors) open a subdomain on tumblr.com.
Just like keywordxxx.tumblr.com , and use following script to redirect to my website.
var s=document.referrer; if(s.indexOf("google")>0 || s.indexOf("bing")>0 || s.indexOf("yahoo")>0 || s.indexOf ("aol")>0){ self.location='mywebsiteurl'; }
so , If anyone seach in google ,and click on keywordxxx.tumblr.com , this script will direct the user to my website. I have found many cases like that, is that harmful ? how can i avoid that?
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Well, most certainly Google would consider that to be cloaking on the tumblr subdomain. I'm not sure that the algorithm would spot this and find it to be a problem, but if I were a Google spam engineer, and asked to look at this, it would be very hard to convince me that it wasn't set up deliberately to build traffic to your site. I would disavow that tumblr subdomain (the subdomain only, e.g. keywordxxx.tumblr.com, DO NOT disavow tumblr.com!).
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