Aleksandrova, Yanka Georgieva, and Silvia Stoyanova Parusheva. “Social Media Usage Patterns in Higher Education Institutions – An Empirical Study”. International Journal of Emerging Technologies in Learning (iJET), vol. 14, no. 05, Mar. 2019, pp. pp. 108-121, doi:10.3991/ijet.v14i05.9720.