Referer spam

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Referrer spam (also known as log spam or referrer bombing[1]) is a kind of spamdexing (spamming aimed at search engines). The technique involves making repeated web site requests using a fake referer URL to the site the spammer wishes to advertise.[2] Sites that publish their access logs, including referer statistics, will then inadvertently link back to the spammer's site. These links will be indexed by search engines as they crawl the access logs.

This benefits the spammer because the free link improves the spammer site's search engine ranking owing to link-counting algorithms that search engines use.

Technical solutions[edit]

As with e-mail spam, referrer spam may be filtered or blocked.[3] A website operator may mitigate referrer spam by preventing search engine spiders from crawling the site logs by moving them to a non-public area such as a password-protected area, by using a robot exclusion file, or by appending the nofollow value to the links.

See also[edit]


  1. ^ Google Groups.
  2. ^ Abbatiello 2011.
  3. ^ Fighting Blog or Comment Spam, Web Spam, 2014, retrieved 14 February 2014 


External links[edit]