I've never really considered this much. Plenty of organisations use them to create awareness as people join the page if they are fans and then all their "friends" see the update seeing that they joined. However getting to know your patrons and what exactly the users want is another thing.
I think it is a good idea to get into the space of the people and ask them what they want as was mentioned in a recommended article. However, this could be seen as being invasive if it is pushed too much.
Maybe if there was a page that linked to our own search catalogue and then have something ust as interactive on our own page.
Sounds good I suppose :P