Google has finally decided to disclose the revenue share for AdSense - or at least part of AdSense. They've revealed the percentages for AdSense for Content and AdSense for Search, but are remaining mum on some of the other offerings. Still, content and search are the two biggies.

The company says this is an effort to increase transparency, and will display the revenue shares right in the AdSense interface sometime within the next few months. While that may take a little time, they've still revealed the percentages as they stand right now.

"AdSense for content publishers, who make up the vast majority of our AdSense publishers, earn a 68% revenue share worldwide," says Neal Mohan VP, Product Management. "This means we pay 68% of the revenue that we collect from advertisers for AdSense for content ads that appear on your sites. The remaining portion that we keep reflects Google's costs for our continued investment in AdSense — including the development of new technologies, products and features that help maximize the earnings you generate from these ads. It also reflects the costs we incur in building products and features that enable our AdWords advertisers to serve ads on our AdSense partner 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," adds Mohan. "As with AdSense for content, the proportion of revenue that we keep reflects our costs, including the significant expense, research and development involved in building and enhancing our core search and AdWords technologies. The AdSense for search revenue share has remained the same since 2005, when we increased it."

At this point, Google is still not disclosing its revenue shares for AdSense for mobile applications, feeds, or games. The reason for this the company gives, is that these are still evolving, and they're still learning about the costs associated with supporting them.

Google also says that revenue shares for AdSense for content and search can vary for major publishers with whom the company negotiates individual contracts. In addition, the revenue shares may change in the future, but they don't have any changes planned yet.