Systems, methods, and devices for selecting supplemental content

A method comprising:

• receiving a request for a supplemental content item, wherein the request comprises data indicating a time associated with a last selection of a content item at a user device and data indicating a time associated with a last user interaction with the user device;
• determining, in response to the request and based at least on the data indicating the time associated with the last selection of the content item at the user device and the data indicating a time associated with a last user interaction with the user device, at least one supplemental content item;
• and
• sending the at least one supplemental content item for insertion into a supplemental content insertion opportunity in the content item.

A method comprising:

• receiving, from a user device, data indicating a time associated with last selection of a content item at the user device and data indicating a time associated with a last user interaction with the user device;
• receiving, from the user device during presentation of the content item at the user device, a request for a supplemental content item for insertion into an available supplemental content insertion opportunity;
• adding, to the request for the supplemental content item, the data indicating the time associated with the last selection of the content item at the user device and the data indicating the time associated with the last user interaction with the user device;
• and
• forwarding, to a server, the request comprising the data indicating the time associated with the last selection of the content item at the user device and data indicating the time associated with the last user interaction with the user device.