Research on the impact of social influence on the individual Information Systems (IS) user represents one of the major challenges of technology adoption research since the introduction of Technology Acceptance Model in 1989. As several IS researchers still struggle from both a theoretical and an empirical perspective to determine how social influence can be explained and measured, this approach contributes to existing adoption research by providing the findings of a literature analysis of all journal and conference articles of the JAIS journal ranking and the AIS proceedings since 1989. The results based on 149 relevant papers reveal that social influence is more significant using a individualized measurement and more important for the usage of utilitarian IS. Additionally it is shown that the point of adoption (pre-adoption vs. post adoption) and the degree of free decision-making (mandatory vs. voluntary) do not affect the impact of social influence.