Proceedings of 5th Annual American Business Research Conference 6 - 7 June, 2013, Sheraton LaGuardia East Hotel, NY, USA, ISBN: 978-1-922069-24-5 Online Social Networks and Employee Productivity: A Longitudinal Study Andrea Potgieter* In 2008, a study was conducted in the University of Johannesburg's Faculty of Management, to determine the perceived impact of Online Social Networks on the productivity of this Faculty's employees. The survey was distributed to 183 employees and obtained a response rate of 48.6%. In 2012, the survey was repeated and sent to 145 employees (with a response rate of 44.8%), within the same Faculty, to establish a longitudinal comparison of how these perceptions have changed. Both times, the survey was complimented by a qualitative survey with openended questions, directed at key individuals dealing with either the instruction or administration of Web-related matters at the University of Johannesburg. The purpose of this paper is to report on the initial findings of the survey in 2008 and discuss the consequent results in 2012. The study concluded that employees increasingly recognize the value of Online Social Networks in a professional context. Management, Organizational Behavior *Ms. Andrea Potgieter, Department of Information & Knowledge Management, University of Johannesburg, South Africa. Email: apotgieter@uj.ac.za