I think this is just about the advertising dollars. Facebook is quickly learning that on-page advertising conversion rates (and thus ad rates) are much lower th

I think this is just about the advertising dollars. Facebook is quickly learning that on-page advertising conversion rates (and thus ad rates) are much lower than search. So they want a piece of that action. The other thing they really need to do is become the default search engine on some popular browsers. Obviously Chrome is out and probably Firefox, but there's no reason they couldn't become one of the options on IE 9.