The ability to monitor state behavior has become a critical tool of international governance. Systematic monitoring allows for the creation of numerical indicators that can be used to rank, compare and essentially censure states. This article argues that the ability to disseminate such numerical indicators widely and instantly constitutes an exercise of social power, with the potential to change important policy outputs. It explores this argument in the context of the United States’ efforts to combat trafficking in persons and find evidence that monitoring has important effects: countries are more likely to criminalize human trafficking when they are included in the US annual Trafficking in Persons Report, while countries that are placed on a “watch list” are also more likely to criminalize. These findings have broad implications for international governance and the exercise of soft power in the global information age.