At the library system I work at, we just begun using Thinkfinity as a way to share information back and forth between the young adult related librarians in the system, which includes the directors, young adult librarians, or (like me) circulation workers who work as young adult librarians without the title (haha.) .
Thinkfinity is a pretty great space to use if we actually utilized it as a way to share more information. Currently, it is mostly used as a way to share reviews of teen and children’s books we receive for gratis from the publishers. Each publishing house as a message board type area where users can update their reviews so other librarians can check them out to see if they want to purchase one for their collection or, as I use it, to see if we want to use it for story time or as a teen book club selection. Before, a spreadsheet was created in Excel and the librarians would email this back and forth with their updates. I never looked at this because it was awful to try to find the new entries and some of the librarians would update it with such minimal information that this was useless. I think if we explored the functionality of Thinkfinity, we could use it for so much more information sharing, such as programming suggestions and the like, but it is currently being under utilized and a lot of the people who signed up initially have forgotten about it, as happens with a lot of social networking resources.
A new social media 2.0 development in my library that is on the upswing: FourSquare. We’ve offered users of FourSquare a free DVD rental (usually costs $2) for their first check – in at the library. We’ve had a few people take advantage of this and hopefully a lot more will follow suit.