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Yesterday Google finally revealed the share of revenue received by publishers using the Adsense for Content and Adsense for Search products.

In a post on the Adsense Blog, Neal Mohan VP, Product Management writes,

“AdSense for content publishers, who make up the vast majority of our AdSense publishers, earn a 68% revenue share worldwide. This means we pay 68% of the revenue that we collect from advertisers for AdSense for content ads that appear on your sites … Since launching AdSense for content in 2003, this revenue share has never changed.”

“We pay our AdSense for search partners a 51% revenue share, worldwide, for the search ads that appear through their implementations … The AdSense for search revenue share has remained the same since 2005, when we increased it.”

“The revenue shares for AdSense for content and AdSense for search also can vary for major online publishers with whom we negotiate individual contracts.”

A closely guarded secret since the launch of Adsense in 2003, it appears an Italian antitrust investigation is largely responsible for the disclosure, or at least in its coming now.

In response to the complaints against it, earlier this month Google proposed changes to its contracts with Italian publishers, which included greater transparency in its sharing of advertising revenue. It looks as though having made the figures available for Italians, Google thought it in its best interests to do the same worldwide.

Google has not released the revenue share for any of the other Adsense products, such as Adsense for Feeds, or Adsense for Mobile. Google says it isn’t disclosing the revenue shares for these products yet because they’re quickly evolving, and its still learning about the costs of supporting them.

It will be interesting to see if this leads to competitors touting larger revenue shares in order to pull in more publishers.

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Google has announced that it is collecting and storing data collected from searches users carry out on any search engine, and using it to better target ads to them on AdSense enabled sites they visit over the next few hours.

Google was already using the referral URL (the link a user followed to arrive at a site) as a factor in determining which ads to display on an AdSense enabled page.

Whenever a user arrives at a website after clicking a link in the search results of a search engine, the keyword terms they used in the search query are always appended to the referral URL (you can see this in your server logs).

On destination sites displaying AdSense ads, Google extracts this search term and treats it as part of the content of the site.

Google give the following example:

“The referral URL passed to your site may look something like this: http://www.google.com/search?q=golf+shop+atlanta.

To deliver the most relevant ad … we could use the additional information from the query words to show an ad for a golf shop in Atlanta rather than for one in Chicago (depending on the other words in the page).”

Now Google has gone a step further.  This search information is being stored in the advertising cookie on the user’s browser, and used to target ads to them on other AdSense enabled sites they may visit subsequently over the next few hours.

Google say, “After a short period of time (a few hours) the query words are no longer used for the purposes of matching ads.”

Note that Google doesn’t say the data is deleted. Or even that it is no longer used. They only say, “no longer used for the purposes of matching ads” (emphasis mine).

And although Google go on to remind us that users can opt out of its advertising cookie at any time here, realistically, how many non-webmasters will be aware that this is happening? Or even know about the advertising cookie and that they can opt out?

It might prove to be good for users of AdSense though. I have certainly noticed a jump in clicks on my AdSense ads over the last 2 days, though it’s too soon to draw any conclusions. Check your stats and see if you have a spike.

But if clickthroughs do increase appreciably, knowing Google they’ll probably gradually reduce the webmaster’s share of the ad price still further until there’s no net gain …  all too easy to do when you keep the formula a secret.

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