Notifications on mobile devices

A computer system for displaying notifications for a content item on a mobile device to a user, the computer system comprising:

• an input port configured to:
• receive meta-data associated with the content item and context data indicative of a current context of the mobile device, and
• receive historical data corresponding to the meta-data of the content item, wherein the historical data is indicative of historical interactions by the user with historical notifications at prior times in a historical context, the historical notifications having been displayed on the mobile device at the corresponding prior times in the historical context by an application installed on the mobile device via a visual component usable by multiple applications installed on the mobile device, wherein the visual component allows the user to open the application by selecting one of the historical notifications in the historical context;
• a processor configured to:
• evaluate a decision model, that is stored on a data store and that comprises model parameters based on the historical data, for the meta-data and sensor data, to determine a first value based on the meta-data, the context data and the historical data, the first value being indicative of a current likelihood of the user interacting with a notification that is based on the meta-data in the current context;
• send first output data based on the first value to an output port to allow selectively outputting the notification based on the current likelihood;
• receive input data indicative of a user interaction in relation to the notification;
• determine updated model parameters based on the sensor data and the meta-data;
• and
• store the updated model parameters on the data store to allow evaluating the model comprising the updated model parameters;
• and
• the output port configured to receive the first output data.