This document is currently being worked on and is very much incomplete. Please contact me if you're interested in contributing to it.
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It's what Google has always wanted to do, and it seems that it's what Facebook is going to do very soon. Where Facebook _was_ a fad, now it seems to make much more business sense. The question really is about strategy and partnership. The click through rates on Facebook itself are horrible, so the question is can it do better for the web. Well, the question really lies in what one is attempting to achieve. If a marketer is looking to go after a certain demographics or psychographics then Facebook's new strategy makes a lot of sense.