Facebook is infiltrating sites all over the web. These sites are happy to add Facebook's social plug-ins. What if Facebook launched an AdSense-like product - a product that lets publishers stick relevant ads from Facebook on their sites for a cut of the money? They would be HIGHLY, HIGHLY targeted because the more sites that use plugins like Facebook's like button, the more users will share their likes with Facebook, which goes to the profile, which is where Facebook already draws its information from to serve its own ads today.
These ads are already pretty well targeted, when the user has enough information in their profile. Social plugins like the like button will only facilitate the population of such information in the profile.
Apparently Mashable founder Pete Cashmore has a similar view on this, as he says in an article for CNN, "Google makes the vast majority of its money from ads -- these ads typically match your search terms, or the content of the Web page you're viewing. Google has certainly worked to personalize these ads, but its knowledge of your friends and interests is more limited than Facebook's."
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