Which interface is used to set up an ad campaign for the Facebook App?

The Ads Manager is the primary interface used to set up ad campaigns on Facebook. It provides a comprehensive suite of tools that allows advertisers to create, manage, and analyze their campaigns effectively. Users can define their target audience, set budgets, choose ad placements, and measure performance metrics all in one place. This centralized approach supports the detailed targeting capabilities and the ability to optimize campaigns based on various objectives, such as brand awareness, lead generation, or app installs.

Other options may relate to aspects of the advertising process but do not serve as the main interface for setting up campaigns. For example, Facebook IQ ads focuses on insights and analytics rather than campaign creation, Mobile Studio Advertising is typically tied to mobile app ads but not specifically for creating campaigns, and Creative Hub ads is geared more towards ad creation and experimentation rather than managing full campaigns. Thus, Ads Manager is the correct choice for setting up an ad campaign for the Facebook App.