This study aims to determine if "Facebook," when used as an online teacher portfolio (OTP), could contribute meaningfully to pre-service teachers' professional development (PD) and in what ways the OTP can be meaningful. Pre-service teachers (n = 91) were asked to develop OTP using "Facebook" and engage in learning and professional development (PD) activities for 14 weeks. Questionnaires, open-ended items and reflective reports were used to collect data and it was found that many of the pre-service teachers benefitted quite significantly in terms of their development as future teachers through these five facets: (i) community of practice; (ii) professional learning and identity; (iii) relevant skills; (iv) resources; and (v) confidence.