Efek komunikasi akun resmi media sosial brand korporasi terhadap keinginan membeli produk perusahaan pengembang properti (penelitian akun facebook resmi PT. Lippo cikarang) = The effect of corporate brand social media official account to the purchase intention of the products of a property developer company (a research on PT Lippo Cikarang s official facebook account) / Mochammad Surjo Koentjoro