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This article attempts to clarify some unresolved or unclarified issues in applying social influence theories. It first reviews the fundamental components of social influence models making specific reference to social information processing theory. It then applies network analysis constructs to identify the conceptual foundations of three proximity mechanisms (relational, positional, and spatial) and two sources (individual and group) of social information processing. This discussion may help to make explicit some of the motivations behind particular choices in testing theories of social influence.