Twitter & Libraries, revisited [excel file]
It was over two years ago when I researched Libraries using twitter for a library school assignment. Back then, there were about 90-100 libraries on twitter. As much as time has allowed, I kept an updated list. Just typing them into a blog post is a bit user unfriendly, so I put the list in an excel file. The goodness that comes from this is the ability to filter and sort by academic, public and special libraries, or subspecializations like law or teens.