Abstract
Today, social networks have become essential communication tools. The emergence of internal social media platforms and applications in the workplace has created great digital opportunities for employees to communicate, collaborate, exchange work-related information, and share professional knowledge. Accordingly, the objective of this research is to explore the effect of social media use in the workplace. Specifically, the present study aims to identify the effect of social media use on employees' work performance through their impact on social capital and knowledge sharing. A research model was proposed and empirically tested with an online survey study of 328 working professionals who use social media in a telecommunication company - "Tunisie Telecom,,. Results reveal that social media use in the workplace positively influence social capital, which impact knowledge sharing among employees that leads to better work performance. Implications and directions for future work are discussed.