13. A system comprising: one or more processors; and a machine-readable medium comprising instructions stored therein, which when executed by the processors, cause the processors to perform operations comprising: receiving a query to provide one or more items, of a plurality of items, for display to a user within a stream, the query identifying search criteria including one or more tokens up to a threshold number of tokens, the one or more tokens including at least a user token identifying the user, wherein the one or more tokens include a super doc token identifying a type of item owned by a super followee user, the super doc token replaced a super followee token corresponding to the super followee user, the super followee user owns an item visible to a number of users that meets a threshold number of users; identifying a set of items including one or more items from the plurality of items having tokens matching at least one of the one or more tokens, the plurality of items comprising items generated by one or more users and wherein each of the plurality of items includes one or more tokens including one or more user tokens up to a threshold number of user tokens, the one or more user tokens indicating viewability of the item by users associated with the one or more user tokens; determining one or more items of the set of items visible to the user, wherein an item is determined to be visible to a user when the user is authorized to view the item; sorting the one or more items; and providing the one or more items according to the sorting in response to the query.
13. A system comprising: one or more processors; and a machine-readable medium comprising instructions stored therein, which when executed by the processors, cause the processors to perform operations comprising: receiving a query to provide one or more items, of a plurality of items, for display to a user within a stream, the query identifying search criteria including one or more tokens up to a threshold number of tokens, the one or more tokens including at least a user token identifying the user, wherein the one or more tokens include a super doc token identifying a type of item owned by a super followee user, the super doc token replaced a super followee token corresponding to the super followee user, the super followee user owns an item visible to a number of users that meets a threshold number of users; identifying a set of items including one or more items from the plurality of items having tokens matching at least one of the one or more tokens, the plurality of items comprising items generated by one or more users and wherein each of the plurality of items includes one or more tokens including one or more user tokens up to a threshold number of user tokens, the one or more user tokens indicating viewability of the item by users associated with the one or more user tokens; determining one or more items of the set of items visible to the user, wherein an item is determined to be visible to a user when the user is authorized to view the item; sorting the one or more items; and providing the one or more items according to the sorting in response to the query. 18. The system of claim 13 , wherein the one or more tokens comprise one or more of a user token identifying the user or an owner token identifying an owner of an item.