A very comprehensive list of how to set up a Google + page for your library. It is worth to Bookmark it!
"A day or so ago, Google Plus finally opened up organizational Google Plus Pages to everyone.
Make use of the fastest growing social network ever at your library with the long-awaited Google+ Pages feature for organizations and brands.
Google Plus Pages are the Google answer/alternative to a Facebook (though I prefer to think of it as a complement for a full social media plan). Your library can use this powerful social tool to host video Hangout chats, isolate user and staff groups for targeted dissemination and conversations with Circles, and increase your Library’s social exposure with the +1 button.
I will definitely be adding Library Pages on Google+ to my Circles as a way of bringing libraries into my digital life."