Pinterest has a new feature that I think has potential for libraries--- Pinterest Place Pins allow a map to to be added to a Pinterest board and pins to be added to that map using integration with Foursquare and other partner sites.
Here's a link to one of my regular Pinterest boards, "Library and book stuff." It contains lots of pins I found interesting-- but no related map. (Tip: if you're prompted to join Pinterest when viewing the board, you can dismiss that window by pressing Esc)
Now here's a link to a board I created of some of my favorite places... South Central Library System libraries! To clarify, ALL the South Central Library System libraries are my favorites, of course, but for this example I only added Place Pins for those libraries that already had pictures on FourSquare. (Tip: Older versions of IE may not display the map.)
Now... it seems like there are some possibilities here! Users might pin your library as a place they like to visit, a good place to go with kids, etc. For example, New York City Public Library gets a listing on this "Free and almost free in NYC" Pinterest board. Libraries might create boards with links to resources in the community or even just other places of interest. Check out this Today post with step-by-step instructions for using Place Pins and an example of Place Pins using sunsets submitted by viewers.
From a social media and marketing standpoint, this might be one more reason to claim your library's location on FourSquare -- a click-through from Pinterest has the potential to bring new visitors to your website or to your building with correct URL, address, phone, and hours information from FourSquare! A lot of sites are already pointing out the potential for businesses, bed & breakfasts, restaurants, and more. I think libraries could be in the mix-- what do you think?
Side note: One of my favorite parts about writing this post was seeing the variety of pictures and tips that FourSquare users added for the libraries. Fun!