Design and Implementation of FS-I Method to Improve Effectiveness of Product Advertising using Social Media, Based on Quality Function Deployment and Fuzzy ServqualNenny Sulestiyowati, R. Rizal Isnanto and Adian Fatchur RochimE3S Web Conf., 202 (2020) 14006DOI: https://doi.org/10.1051/e3sconf/202020214006