Robin Good: If you are looking for great examples of Facebook marketing at work, you may want to check the Facebook Studio, an official gallery/catalog of marketing campaigns using FB.
"...a place where creative agencies and marketers can deposit examples of great campaigns that leverages on the online social network to connect with audiences and have authentic conversations.
So far Facebook Studio has over 750 examples submitted and approved from around the world, and Facebook also holds the Facebook Studio Awards every year to recognize and laud the best work in the field.
Agencies can create an online profile on Facebook Studio that shows off their creative digital work, along with any of the awards accorded by Facebook.
These profiles go into a directory which is searchable and accessible, so you can preview the work.
Creatives who have worked on those projects or campaigns can be “tagged”, so people know who’s been involved in them. Creative individuals can also build their own profiles – which is separate from their regular Facebook profile (although they can be linked) – so that they can be tied to the work they’re involved in."
Check it out here: http://www.facebook-studio.com/