The document summarizes several communication theories: 1) The two step flow theory describes how information spreads from media to opinion leaders to the general public with the opinion leaders' interpretations. 2) Cultivation theory examines how heavy TV viewing shapes peoples' beliefs about social reality to reflect what is portrayed on TV. 3) Reception theory focuses on how individual readers interpret and make meaning from texts. 4) Uses and gratifications model identifies needs (diversion, identity, information, companionship) that audiences actively use media to fulfill.