It's a network model, where the interactions carry $$ value. Social network = connected nodes, each interaction is typically free (content) Market network = c

It's a network model, where the interactions carry $$ value. Social network = connected nodes, each interaction is typically free (content) Market network = connected nodes, each interaction typically involves payment Marketplace = a forum for buyers and sellers (can be 2 sided, 3 sided etc..) Market network = an N-sided marketplace (thus it looks like a network)