 This study aims to examine problematic internet use, PIU, Internet Gaming Disorder, IGD, and social media addiction, SMA, together among U.S. young adults aged 18 to 25 years, and evaluate the frequency of an overlap in positive screening scores for these conditions. The results show that there is overlap across PIU, IGD, and SMA in some associated demographic variables and health outcomes, but the patterns in the associated variables demonstrate unique qualities of each of these conditions. This article was authored by Megan Moreno, Karen Riddle, Marina C. Jenkins, and others.