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For those of you with Google AdSense on your websites, Google is asking/requiring/suggesting you update your site’s privacy policy by April 8th, 2009.

Google will now be collecting additional data on your visitors past history to gain “interest categories” to determine what your visitor may like to see ads for.

Here is what Google e-mailed to all AdSense publishers:

Interest-based advertising will allow advertisers to show ads based on a user’s previous interactions with them, such as visits to advertiser website and also to reach users based on their interests (e.g. “sports enthusiast”).  To develop interest categories, we will recognize the types of web pages users visit throughout the Google content network.  As an example, if they visit a number of sports pages, we will add them to the “sports enthusiast” interest category.  To learn more about your associated account settings, please visit the AdSense Help Center at http://www.google.com/adsense/support/bin/topic.py?topic=20310.

As a result of this announcement, your privacy policy will now need to reflect the use of interest-based advertising. Please review the information at https://www.google.com/adsense/support/bin/answer.py?answer=100557 to ensure that your site’s privacy policies are up-to-date, and make any necessary changes by April 8, 2009.  Because publisher sites and laws vary across countries, we’re unfortunately unable to suggest specific privacy policy language.

For more information about interest-based advertising, you can also visit the Inside AdSense Blog at http://adsense.blogspot.com/2009/03/driving-monetization-with-ads-that.html.