Purpose -This paper aims to present an overview of how libraries are using Twitter in an academic setting. Design/methodology/approach -This study analyzed the current state of 296 Twitter accounts from a random sample of academic libraries. A total of 19 different criteria were explored, with an emphasis on the following three categories: layout and design, content and number of tweets, and account followers. Findings -Only 34 per cent of libraries in the study had a Twitter account and characteristics varied widely among libraries, however it is evident that it is possible to successfully communicate with patrons via Twitter. Research limitations/implications -A primary limitation for this study is the frequency with which Twitter can change. Practical implications -This paper provides a snapshot of how libraries are currently using Twitter, which can be of assistance to libraries seeking to implement a Twitter presence. Originality/value -The paper presents an overview of trends in academic library Twitter accounts, which could be useful to librarians who are considering launching a Twitter account for their library.