Module ranking for a modular inbox

Exemplary embodiments relate to improvements in the design of a messaging inbox. The inbox may display different units or "modules" for providing a user with quick access to different inbox functionalities. Content may be ranked and ordered within a module, and modules may be ranked and ordered with respect to each other. Inter-module ranking may be based on elements such as individual activity and the activity of the messaging service's user base, the value of the module to the messaging service, and offline models. Intra-module ranking may be defined by individual modules (e.g., based on recency, importance to user, affinity, etc.). Intra-module ranking may affect inter-module ranking, such as when individual content in a low-rated module is particularly exciting or pertinent (causing the entire module to receive a higher inter-module ranking).