This article highlights the advantages of librarians and libraries establishing a professional or institutional presence on Twitter. This basic introduction to the web service also discusses innovative ways to shape your Twitter account into a successful professional development, reference, and outreach resource.
Forrestal, Valerie. "Making Twitter Work: A Guide for the Uninitiated, the Skeptical, and the Pragmatic." The Reference Librarian 52, no. 1-2 (2010): 146-51.