PurposeVirtual communities of practice (VCoP) are becoming increasingly popular as professional networking. These communities support and shape professional development, especially in countries with limited opportunities and constrain like time and distance. This study throws light on the role of VCoP and its impact on the continuous professional development (CPD) of librarians in Pakistan.Design/methodology/approachThis study is carried out with qualitative research methods to understand effects of VCoP on CPD. With a thematic content analysis on the email conversations of a library and information science (LIS) Yahoo mailing group “plagpk”, the impact of virtual communities (VCs) on librarians' professional development in Pakistan over the past 20 years was analyzed.FindingsThis study demonstrates that VCs contribute to professional learning, problem-solving, knowledge creation, professional awareness and identity creation in the LIS field. Further, this study contributes a model to explain the formal and informal professional development for individuals and groups through VCoP engagement.Social implicationsIt is hoped that this study will help the librarian community create, get involved in the VCoP for personal, professional development consciously and create an impact in the profession. The finding of this study is generalizable to any social sciences or humanities professionals VCoPs.Originality/valueThis is one of the first studies in the LIS field to analysis the impact of VCs on the professional development of the librarians.