Abstract: A system is described including a processor and a model configured to automatically identify electronic messages that are likely to result in the computing system performing one or more subsequent messaging actions. The processor is configured to responsive to determining that an electronic message satisfies initial criteria for invoking the model, determine, using the model, whether the electronic message is likely to result in the system performing a messaging action from the one or more subsequent messaging actions. Responsive to determining that the electronic message is likely to result in the system performing the messaging action, the processor is configured to modify the electronic message to include an indication of the messaging action and a future time for outputting a notification of the messaging action, and output, at the future time, the notification of the messaging action.

Abstract: Recommending content items is disclosed. In some embodiments, determining an item to recommend includes receiving an indication that a first item is of interest and selecting a second item to recommend based at least in part on a degree of similarity of the second item to the first item as determined based at least in part on a number of other instances in which both the first item and the second item have been of interest and a first decayed popularity of the first item. In some embodiments, the degree of similarity of the second item to the first item is determined based in addition on a second decayed popularity of the second item.

Abstract: Recommending content items is disclosed. In some embodiments, determining an item to recommend includes receiving an indication that a first item is of interest and selecting a second item to recommend based at least in part on a degree of similarity of the second item to the first item as determined based at least in part on a number of other instances in which both the first item and the second item have been of interest and a first decayed popularity of the first item. In some embodiments, the degree of similarity of the second item to the first item is determined based in addition on a second decayed popularity of the second item.