Referrer Spam Definition
Referral Spam definition is covered by Wikipedia very well and is no doubt a very bad thing for website owners and webmasters. Anyone lookin gto review as to what i tis and ho wit is done should reada below or click over on the Wikipedia link entitled Referrer spam for more information.
Referrer spam (also known as log spam or referrer bombing) is a kind of spamdexing (spamming aimed at search engines). The technique involves making repeated web site requests using a fake referrer url that points to the site the spammer wishes to advertise. Sites that publicize their access logs, including referrer statistics, will then end up linking to the spammer's site, which will in turn be indexed by the search engines as they crawl the access logs.
This benefits the spammer because of the free link, and also gives the spammer's site improved search engine ranking due to link-counting algorithms that search engines use.