Do Social Media Marketing Activities Build Long-Term Relationships? An Empirical Study of Indonesian Cosmetic Brand on Gen ZAnnisya Erobathriek, Christian Haposan Pangaribuan, Okta Prihatma Bayu Putra and Desman HidayatE3S Web Conf., 426 (2023) 02139DOI: https://doi.org/10.1051/e3sconf/202342602139