This study investigated the motivators knowledge workers employ when sharing knowledge though enterprise social media (ESM) in a telecommunications context. A questionnaire was distributed among knowledge workers in one of the leading telecommunication companies in the Sultanate of Oman. Based on the Structural Equation Modelling-Partial Least Squares (SEM-PLS) analysis of 100 responses from knowledge workers, results showed that technological motivators had significant effects on knowledge workers’ knowledge sharing through ESM. Further analysis based on the knowledge type indicated that technological motivators and organizational motivators significantly impact knowledge workers’ tacit knowledge sharing, whereas only technological motivators impact knowledge workers’ explicit knowledge sharing. This study provides decision makers with useful insights on the motivators of sharing knowledge through ESM and further advances knowledge workers’ learning and business operations, especially in under-investigated countries.