We quantify the effects of others' adoptions and word-of-mouth (volume and valence) on consumers' product adoption decisions. We differentiate between the effects of word-of-mouth and observed adoptions from friends ("personal network") and the effects of word-of-mouth and observed adoptions...

We study how strangers become friends within an evolving online social network. By modeling the co-evolution of individual users' friendship tie formations and their concurrent online activities (product adoptions and content generation), we are able to discover important drivers underlying...