I imagine at some point FB will launch an ad platform similar to AdSense that lets publishers run FB ads on their sites. Once FB marries the targetting they can

I imagine at some point FB will launch an ad platform similar to AdSense that lets publishers run FB ads on their sites. Once FB marries the targetting they can get at by owning the social graph and the accompanying information with higher value ads space outside of FB, that's when Google will be in for a fight. I would launch that ad platform right before I IPO'd if I were FB.