Pengaruh komunitas merek di media sosial terhadap penanda komunitas, penciptaan nilai, kepercayaan merek, dan loyalitas merek, studi kasus : Komunitas Merek BlackBerry Indonesia = The effects of social media based brand communities on brand community markers, value creation practices, brand trust, and brand loyalty, case study: BlackBerry Indonesia Brand Community (Universitas Indonesia. Fakulats Ekonomi, 2013)