Short et al., 1976
The degree of salience of the other person in the interaction and the consequent salience (and perceived intimacy and immediacy) of the interpersonal relationships.
Short, J., Williams, E., & Christie, B. The social psychology of telecommunications. UK: Wiley. 1976:65
Thurlow et al., 2004
Level of interpersonal contact and feelings of intimacy experienced in communication.
Thurlow, C., Lengel, L., & Tomic, P. A. Computer mediated communication. Los Angeles: Sage. 2004:48