US Patent 9952748 Contextual recommendations based on interaction within collections of content

The subject matter of this specification can be implemented in, among other things, a method that includes storing one or more first content items and a second content item that belong to a collection at a content hosting system. The method further includes receiving one or more interactions with the first content items from one or more first user accounts. The method further includes selecting, by a processing device, the second content item and providing a recommendation to a second user account to view the second content item based on the second content item belonging to the same collection as the first content items and on the interactions with the first content items.