Referrer spam 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 placement due to link-counting algorithms that search engines use.

Technical solutions

As with e-mail spam, web site operators who receive unwanted referrer spam may respond using filtering and blocking.

A simple solution to render this form of spamming ineffective is to prevent the 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.

From Wikipedia under the GNU Free Documentation License
Sat Jul 3 06:39:11 2010

Want free gift cards? Not spam! This works!?
Q. There is a website out there that offers free gift cards to girls who maybe need a little cash to buy clothing and such!! Signing up is completely free and all you have to do is earn points! It's not impossible like Swagbucks, it will only take a little bit of time before you receive your first gift card. This really does work! I've done it, and know people who are one their 4th one! They ship internationally, and shipping and handling is completely FREE! If you live in Canada ( like I do) ir anywhere else they send you a visa as you may not be able to use the gift cards to stores offered in the U.S. Go here: Still skeptical? Here's an interview Seventeen magazine did with founder Katelyn Rose: join now!! And no I'm not being… [cont.]
Asked by limonadmoi - Tue Feb 16 17:57:27 2010 - - 1 Answers - 0 Comments
How to Get Free Microsoft points?
Q. The place to go is rewards1. Rewards1 is a new site and now is the time to get involved, while it's still easy to get prizes and get in on the ground floor. Rewards1 destroys other similar sites like GamingLagoon because the offers credit faster and Rewards1 will not call you (unlike GamingLagoon). If you haven't already signed up, you can sign up under my referral link if you'd like right here to get sign up bonus points Note: The offers on this site only work for US and Canadian residents. But anyone can do referrals and earn prizes (as long as it is shipped via email, they will not ship physical items for anyone outside the United States or Canada). Quick List of Prizes: -Wii Points -Nexon Cash -DS/PSP system -Various… [cont.]
Asked by Jick G - Mon Jun 30 02:32:00 2008 - - 1 Answers - 0 Comments

A. Kewl!! thanks!
Answered by jwishz - Thu Jul 3 18:16:24 2008

Why do people look at all blacks the same?
Q. Like just cause some blacks are nasty, violent & likes to stir trouble. why do other races look at us as the same? & Vice or Versa as for whites. BTW I really need help,..ok Christmas is not long away & I asked my mom could i get PS3, and she told me she didnt have the funds, and now for some reason Christmas is not going to feel like Christmas, until i was playing one of my favorite games. & there is a contest on there where i can win a PS3!!! all i need is to refer people to the game so they can sign up. So far i only have 0 referrals. Im begging you could you please help me out?, with both my question & my wish. Here is the referral link & I promise on my life you will not get any spam or viruses and its not a porn site. Just… [cont.]
Asked by KingOfTheStrts - Tue Dec 15 17:24:58 2009 - - 1 Answers - 0 Comments

A. You shouldn't worry about what others think. Just be you and I guarantee you will find some one you wants to be your friend. No matter what keep your head held up high and remember that you are better that them so you shouldn't sink to their level. Try to surround your self with people who you feel comfortable with and don't try to fit in by being something that you are not. Be comfortable with the skin that you are in and thank God because your situation could be a lot worse... xoxoMiiS Yaya BaBii
Answered by --<<*!*DaNgEr*!*>>-- - Tue Dec 15 17:43:45 2009

From Yahoo Answer Search: "Referrer Spam"
Sat Jul 3 06:39:16 2010

See also:

Custom search only Referrer Spam sites:

Help build the largest human-edited directory on the web.
Submit a Site - Open Directory Project - Become an Editor
Fri Jul 23 19:55:54 2010
Social Media: The Privacy and Security Repercussions - Search Engine Watch
searchenginewatch.com
Social Media: The Privacy and Security Repercussions - Search Engine Watch
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Search Engine Watch Referrer headers, according to Lavasoft Malware Labs security analysts, are commonly used to distribute malware in SEO poisoning campaigns. ...
Making Your Employee Referral Program Work Smarter Follow-Up Questions And ... - ERE Media
ere.net
Making Your Employee Referral Program Work Smarter Follow-Up Questions And ... - ERE Media
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ERE Media You need information, and both the referrer and the referral need a way to provide it to you that isn't cumbersome. The e-commerce model of sending a link ...
Repossessed Car Auctions - Alternative Car Buying - Boosh News (press release) (blog)
booshnews.com
Repossessed Car Auctions - Alternative Car Buying - Boosh News (press release) (blog)
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Boosh News (press release) (blog) Use a reputable car shipping referrer which only deals with automobile shippers who have a reputation of good quality service. ...

From Google News Search: "Referrer Spam"
Sat Jul 3 06:39:15 2010

referrer spam list 200710 gif
stray.blogdns.org
referrer spam list 200710 gif
424px x 615px | 9.30kB

[source page]

200 spam 403

spamreferrers jpg
aaronlogan.com
spamreferrers jpg
328px x 480px | 32.80kB

[source page]

I m still winning the war against referral spam using htaccess but the battles are heating up

spieler e4bda0e79bb8e4bfa1e98099e6a8a3e79a84e6b091e8aabfe5978eefbc9f
applepig.idv.tw
spieler e4bda0e79bb8e4b​fa1e98099e6a8a3​e79a84e6b091e8a​abfe5978eefbc9f​
397px x 640px | 182.90kB

[source page]

Sidebar Widget blog Widget Adnonsense funP

From Yahoo Image Search: "Referrer Spam"
Mon Jul 26 14:02:29 2010

List of Real User Agents - Black Hat Forum Black Hat SEO
blackhatworld.com
List of Real User Agents - Black Hat Forum Black Hat SEO

alitomari

Wed, 24 Mar 2010 19:26:35 GM

(which could be caught as . referrer spam. by some sites) I however did not remove sites like s i t e .com because there were just too many legit ones that fall into that category. What we're left with is an Alphabetized & somewhat ...

Linha de Codigo - Formularios acessiveis a prova de spam
linhadecodigo.com.br
Linha de Codigo - Formularios acessiveis a prova de spam

unknown

Wed, 16 May 2007 02:02:12 GM

Para navegadores e spambots que nao enviam informacoes '. referrer. ' a mensagem nunca sera setada como . spam. . if((isset($_SER​VER['HTTP_REFER​ER']) && stristr($_SERVE​R['HTTP_REFERER​'],$_SERVER['HT​TP_HOST']))) {$. spam. =true;} ...

Ignore That Scary MSNbot, It's Just The Friendly BingBot Unless ...
techcrunch.com
Ignore That Scary MSNbot, It's Just The Friendly BingBot Unless ...

MG Siegler

Fri, 17 Jul 2009 22:50:20 GM

I received a lot of . referrer spam. from MSN and am still getting refer spam from bing. My logs show lots of generic queries such as: www. bing.com/search​?q=hosting www. bing.com/search​?q=web www. bing.com/search​?q=authenticate​ ...

From Google Blog Search: "Referrer Spam"
Sat Jul 3 06:39:16 2010