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.
Overview
Google uses 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). (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.
History
The underlying technlogy 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.
XHTML Compatibility
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
</img> and </input>
- 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
In addition, the Adsense ad units use the document.write() Javascript code, which does not work in browsers when rendered with
the application/xhtml+xml MIME Type. The units also use the <iframe> HTML tag, which is not validated correctly with the
Strict or Transitional doctypes.
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
A typical mail envelope for standard delivery cheques
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.
For contextual advertisements, 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.
For Site targeted ads, advertiser can choose the page or sites he wants to display ads on and pays on a CPM basis (cost per
thousand impressions)
For referrals Google manage the subscriptions on a long term, to add money when the visitors either download the product of
subscribe, that depend upon the sort of product.
For search, advertisements are added to the list of results and clicks on them make money.
To protect webmasters from bad use of their code, it is possible for them in the configuration panel to make a list of
websites where advertisements are published. When other sites use their JavaScript code, clicks on ads are ignored.
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 little or no content, but filled with
advertisements so users have no choice but to click on ads. Such pages were 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.[citation needed] Google claims they cannot "disclose any specific details" on clicks since
it may reveal the nature of their proprietary click fraud monitoring system.[7]
To help prevent click fraud, publishers of AdWords 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 commercial tracking scripts
available for purchase.
The payment terms for webmasters have also been criticized.[8] Google withholds payment until an account reaches US$100,[9] 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".[10] 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.[citation needed]
See also
References
- ^ Om Malik. "How Google is that?", Forbes, 1999-04-10.
- ^ Paula J. Hane. "Beyond Keyword Searching", Info Today, 1999-12-20.
- ^ Sherman Fridman. "NetZero
Acquires Simpli.com's Marketing Technology", Newsbytes PM, 2000-05-25.
- ^ "Google Acquires Applied Semantics", Press release, 2003-04-23.
- ^ Benaifer Jah. "Trojan Horse program that targets Google Adsense ads", TechShout, 2005-12-27.
- ^ Charles C. Mann. "How click fraud could swallow the
internet", Wired, January
2006.
- ^ Benjamin Cohen. "The
nonsense about AdSense", The Times, 2006-07-04.
- ^ Lem Bingley. "Google keeps on coining it
in", IT Week, 2007-02-01.
- ^ When do I get paid?. Google AdSense Help Center.
- ^ Google Announces Fourth Quarter And Fiscal Year 2006 Results. Google Investor Relations (2007-01-31).
External links
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