Abstract: A machine learning based content server with user categorization and exploration may be provided by system, comprising: a content library; a profile database; and a content server including a machine learning model trained to select content items from the content library for provision to users based on user profiles by performing operations comprising: identifying a current user category that a user currently belongs to, wherein the user profile lacks a characteristic associated by the machine learning model with the current user category; selecting a first content item based on the current user category and the lacking characteristic; providing the first content item to the user; receiving a reply indicating the reaction elicited by the first content item; updating the user profile based on the reaction; identifying a second content item based on the updated user profile; and providing the second content item to the user.

Abstract: A machine learning based content server with user categorization and exploration may be provided by system, comprising: a content library; a profile database; and a content server including a machine learning model trained to select content items from the content library for provision to users based on user profiles by performing operations comprising: identifying a current user category that a user currently belongs to, wherein the user profile lacks a characteristic associated by the machine learning model with the current user category; selecting a first content item based on the current user category and the lacking characteristic; providing the first content item to the user; receiving a reply indicating the reaction elicited by the first content item; updating the user profile based on the reaction; identifying a second content item based on the updated user profile; and providing the second content item to the user.

Abstract: A machine learning based content server with user categorization and exploration may be provided by system, comprising: a content library; a profile database; and a content server including a machine learning model trained to select content items from the content library for provision to users based on user profiles by performing operations comprising: identifying a current user category that a user currently belongs to, wherein the user profile lacks a characteristic associated by the machine learning model with the current user category; selecting a first content item based on the current user category and the lacking characteristic; providing the first content item to the user; receiving a reply indicating the reaction elicited by the first content item; updating the user profile based on the reaction; identifying a second content item based on the updated user profile; and providing the second content item to the user.