Positive Adsense Experiment

by Tom Mullaly on November 7, 2005

Those of you running Adsense on your blog might find this interesting. Over the weekend, I decided to change the number of ads units on my blog based upon where the traffic is coming from. I have a small PHP function that checks to see if the referrer is a search engine, and if it is, I display and additional 2 ad units. My thoughts were that since 80% of my traffic is coming from search engines, I might as well throw a few extra ads at them. My thinking is that if they don’t find what they were looking for at my blog, maybe a Google ad could help them ;-)

The results have so far been very positive, with my Adsense revenue increasing by 284% on Saturday, Sunday and Monday!

To see what my blog looks like from a search referal, do a Google search for Jim Rutherford and click on the top result.

My next step will be trying to remove ads for regular readers – chances are you probably don’t click on my ads anyhow!

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{ 8 comments… read them below or add one }


Careful tailoring content to search engines. I *think* that’s a violation of the AdSense agreement-thingy.


That’s a great idea actually. Why didn’t I think of that? And it’s not “tailoring to SE’s” – that is in reference to cloaking and serving different output to spiders.


A good way for finding regular readers (like me) might be by disabling ads if the referring link came from Bloglines (which I use) and other online RSS readers. Just a thought. Awesome blog!


Kevin – absolutely! My thought was to create a whitelist of referring sites like bloglines, searchfox, google reader, etc., and also looking for hits coming from aggregators like Feed Demon and Net News Wire.


Hi Jim,
great idea! Would be nice, if you could publish the PHP code too!


What is the php code you inserted?


[Positive Adsense Experiment] Was the PHP snippet every posted?


great idea! Would be nice, if you could publish the PHP code too! Thanx,

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