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Well i was wrong (not the first time i know lol). After debating for a while i decided to email Adsense support to find out if Facebook apps violated the TOS or not. To my surprise the reply i got, gave the go ahead.(btw i received a reply in less than 24 hours).
“…webpage complies with our policies and you’re able to edit the source code of the site to allow javascript, then you’re welcome to place Google ads on your site…”

Pretty cool i must say, so of course i went right to some of my apps to add in some code to see how it would work. As you know we have some fairly popular sites, and our apps are “stored” under one of those domains, so of course at first i got ads themed towards the main domain. No biggie i was thinking that referrals would be a better match anyway, so i created a few and after almost 3 years as an Adsense publisher i know it takes ole googlebot a few page views by a different users to get a grasp on a page, i stuck up some adlinks. Within a day or so the adlinks were themed to facebook,(also the name of the directory they were in). so i added the ad units back in, and low and behold i was getting blocks themed towards facebook. These were just called into the canvas page via the fb iframe method, the page itself wasn’t an iframe. So remember your directory and url structure is going to be important. I have also implemented some tests on pages that are complete iframes with pretty good results as well so far, not as great targeting as a “regular” webpage would have but still pretty good. Though if you want to advertise special products i still think Chitika
and their manually targeting option is the better choice, but nothing wrong with running them both. I’m in the process of putting together a top 5 or 10 Adsense for Facebook tips, ill be posting in the next day or two so keep your eyes open.