The internet has profoundly challenged all constituents of the information economy: media, education, publishing and libraries. Social software, web 2.0, the read/write/web – all terms that were once the cusp of innovation and cutting edge – are now part of our everyday workflow. Libraries are constantly embracing new media and technologies to stay relevant, build awareness and ultimately engage with their users. Like most libraries, the University of British Columbia Library has a presence on social media, but how do we know what’s working and what’s not? Using a case study from UBC, we examine and measure the Library’s use of social media and how it interacts with users in a variety of ways, from events to promotions to informational questions, using its own auditing metrics and best practices. Presented at the 2013 British Columbia Library Association annual conference in Richmond, BC May 10. Jessica Woolman is the Web Communications Coordinator for UBC Library’s Communications and Marketing Department. Allan Cho is a Program Services Librarian for the Irving K. Barber Learning Centre.