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'AdSense' is an ad serving program run by Google. Website owners can enroll in this program to enable text, image and, more recently, video advertisements on their sites. These ads are administered by Google and generate revenue on either a per-click or per-thousand-impressions basis. Google is also currently beta-testing a cost-per-action based service.
Google utilizes its search technology to serve ads based on website content, the user's geographical location, and other factors. Those wanting to advertise with Google's targeted ad system may sign up through AdWords. AdSense has become a popular method of placing advertising on a website because the ads are less intrusive than most banners, and the content of the ads is often relevant to the website.
Currently, the AdSense uses JavaScript code to incorporate the advertisements into a participating site. If it is included on a site which has not yet been crawled by the Mediabot, it will temporarily display advertisements for charitable causes known as public service announcements (PSAs). (Note that the Mediabot is a separate crawler from the Googlebot that maintains Google's search index.)
Many sites use AdSense to monetize their content and some webmasters work hard to maximize their own AdSense income. They do this in three ways:
# They use a wide range of traffic generating techniques including but not limited to online advertising.
# They build valuable content on their sites which attracts AdSense ads which pay out the most when they get clicked.
# They use copy on their websites that encourage clicks on ads. Note that Google prohibits people from using phrases like "Click on my AdSense ads" to increase click rates. Phrases accepted are "Sponsored Links" and "Advertisements".
The source of all AdSense income is the AdWords program which in turn has a complex pricing model based on a Vickrey second price auction, in that it commands an advertiser to submit a sealed bid (not observable by competitors). Additionally, for any given click received, advertisers only pay one bid increment above the second-highest bid.

Contents

History

AdSense for feeds

AdSense for search

How AdSense works

Abuse

Criticism

Competitors

See also

References

External links

History

The underlying technology behind AdSense was derived originally from WordNet and Simpli, a company started by the founder of Wordnet — George A. Miller — and a number of professors and graduate students from Brown University, including James A. Anderson, Jeff Stibel and Steve Reiss.^[1] A variation of this technology utilizing Wordnet was developed by Oingo, a small search engine company based in Santa Monica founded in 1998.^[2] Oingo focused on semantic searches rather than brute force string searches.^[3] Oingo changed its name to Applied Semantics, which was then bought by Google for $102 million in April 2003, to replace a similar system being developed in house.^[4]

AdSense for feeds

In May 2005, Google unveiled 'AdSense for feeds', a version of AdSense that runs on RSS and Atom feeds that have more than 100 active subscribers. According to the Official Google Blog, "advertisers have their ads placed in the most appropriate feed articles; publishers are paid for their original content; readers see relevant advertising — and in the long run, more quality feeds to choose from".
AdSense for feeds works by inserting images into a feed. When the image is displayed by the reader/browser, Google writes the ad content into the image that it returns. The ad content is chosen based on the content of the feed surrounding the image. When the user clicks the image, he or she is redirected to the advertiser's site in the same way as regular AdSense ads.

AdSense for search

A companion to the regular AdSense program, 'AdSense for search' lets website owners place Google search boxes on their pages. When a user searches the web or the site with the search box, Google shares any ad revenue it makes from those searches with the site owner. However, only if the ads on the page are clicked, the publisher is paid. Adsense does not pay publishers for mere searches.
As of September 2007, the HTML code for the AdSense search box does not validate as XHTML, and does not follow modern principles of website design:

★ non-standard closing tags such as and

★ the boolean (minimized) attribute checked rather than checked="checked"

★ presentational attributes other than id, class, or style, such as bgcolor and align

★ a table structure used for purely presentational (non-tabular) purposes

★ the font tag
The terms of the AdSense program forbid their affiliates from modifying the code, thus preventing these participants from having validated XHTML websites.

How AdSense works

Each time a visitor visits a page with an AdSense tag, a piece of JavaScript writes an iframe tag, whose "src" attribute includes the URL of the page. Google's servers use a cache of the page for the URL or the keywords in the URL itself to determine a set of high-value keywords. (Some of the details are described in the AdSense patent). If keywords have been cached already, ads are served for those keywords based on the AdWords bidding system.

Abuse

Some webmasters create sites tailored to lure searchers from Google and other engines onto their AdSense site to make money from clicks. These "zombie" sites often contain nothing but a large amount of interconnected, automated content (e.g.: A directory with content from the Open Directory Project, or scraper sites relying on RSS feeds for content). Possibly the most popular form of such "AdSense farms" are splogs ("spam blogs"), which are centered around known high-paying keywords. Many of these sites use content from other web sites, such as Wikipedia, to attract visitors. These and related approaches are considered to be search engine spam and can be reported to Google.
MFA (Made For Adsense) is a site or page with few or none content, but filled with advertisements so user have no choice but to click on announces. Such pages was tolerated in the past, but due to complaints Google now disables such accounts.
There have also been reports of Trojans engineered to produce fake Google ads that are formatted to look like legitimate ones. The Trojan Horse apparently downloads itself onto an unsuspecting computer through a web page and then replaces the original ads with its own set of malicious ads.^[5]

Criticism

Due to concerns about click fraud, Google AdSense has been criticized by some Search engine optimization firms as a large source of what Google calls "invalid clicks" in which one company clicks on a rival's search engine ads to drive up its costs.^[6] Some publishers have been blocked by Google, complaining that little justification or transparency was provided. Webmasters who publish Adsense can receive a lifelong ban without justification. Google claims the revealing of any information may reveal the nature of their "proprietary" click fraud system, and thus Google will not "disclose any specific details".^[7].
To help prevent click fraud, publishers can choose from a number of click tracking programs. These programs will display detailed information about the visitors who click on the AdSense advertisements. Publishers can use that data to determine if they've been a victim of click fraud or not. There are a number of such commercial scripts available for purchase. An open source alternative is AdLogger.
Google has also come under fire for allowing AdWords advertisers to abuse trademarks. In 2004, Google started allowing advertisers to bid on any search terms, including the trademarks of their competitors.^[8]
The payment terms for webmasters have also been criticized.^[9] Google withholds payment until an account reaches US$100 ^[10], but many small content providers require a long time - years in many cases - to build up this much AdSense revenue. These pending payments are recorded on Google's balance sheet as "accrued revenue share". ^[11] At the close of its 2006 fiscal year, the sum of all these small debts amounted to a little over US $370 million - cash that Google is able to invest but which effectively belongs to webmasters. However, Google will pay all earned revenue, even if smaller than 100 dollars, when the Adsense account is closed.
Google came recently under fire after the official Google AdSense Blog showcased the French video-site Imineo.com that clearly violates Google’s AdSense Program Policies by displaying AdSense near explicit adult content while other site owners were banned for showing adult content.^[12]

Competitors

★ Yahoo! Publisher Network - part of Yahoo! Search Marketing

See also

★ List of Google products

★

★ List of acquisitions by Google

References

1. How Google is that?
2. Beyond Keyword Searching
3. NetZero Acquires Simpli.com's Marketing Technology
4. Google Acquires Applied Semantics
5. Trojan Horse program that targets Google Adsense ads
6. How click fraud could swallow the internet
7. The nonsense about AdSense
8. Google plans trademark gambit
9. Google keeps on coining it in
10. When do I get paid?
11. Google Announces Fourth Quarter And Fiscal Year 2006 Results
12. Official Google AdSense Blog showcases Website that displays AdSense near Adult Content

External links

★ Google AdSense

★ Inside AdSense (official blog)

★ AdSense patent application