1. A method comprising: automatically posting a content item to a network accessible collection of content items in response to detecting a triggering event associated with user activity of a user, the content item being related to the user activity of the user, the network accessible collection of content items being viewable by one or more additional users; assigning, by one or more processors, each content item of the collection of content items to a category based on a type of user activity to which each content item is related, the assigning including: assigning a first content item to a first category corresponding to viewed content; and assigning a second content item to a second category corresponding to created content; causing presentation of the collection of content items, the collection of content items being organized in accordance with the category assigned to each content item.