Analisis peran social media untuk membangkitkan engagement dalam membeli kembali suatu merek : studi kasus social media campaign terhadap existing customers nissan = Analysis of social media role for generating an engagement towards customers desire to repurchase a brand case study social media campaign towards existing customers nissan / Daniel Fidelis Ganoto - Daniel Fidelis Ganoto, author (Fakultas Ekonomi dan Bisnis Universitas Indonesia, 2013)