Peer social influence is a robust predictor of problematic drinking among young adults and adolescents; it is typically assessed by collecting nonspecific social network information (i.e., behaviors of peers globally) or specific social network information (i.e., behaviors of named friends). Socialization happens both in-person and online through social media. Exposure to alcohol-related social media content is consistently related to alcohol consumption in cross-sectional and longitudinal studies alike. Previous research has often not focused on who specifically is sharing the alcohol-related social media content with most examining effects of exposure to content posted by nonspecific network members (e.g., peers, friends) and individual alcohol consumption. The purpose of the current critical review is to describe how exposure to alcohol-related social media content is commonly measured and how including a specific social network assessment may explain more variance in alcohol use. The review found inconsistencies in the reference groups used when assessing frequency of exposure and found that specific modalities of content exposure were often not assessed. Of the 30 published studies reviewed, 15 used cross-sectional designs, which is regrettable considering that the composition of adolescent and young adult peer groups have been found to change over time possibly affecting the content viewed. Understanding factors which affect the relationship between exposure to alcohol-related social media content and individual alcohol use has implications for tailoring drinking interventions to address the unique social influence of social media content. Gaps in the literature are summarized and future directions for research are discussed. (PsycInfo Database Record (c) 2023 APA, all rights reserved).