Abstract: In one embodiment, a method includes generating a first query requesting a data structure of a specific data type, retrieving the data structure of the specific data type from one or more hierarchical graphs using the first query, retrieving one or more data items from the hierarchical graphs using the data structure, and validating the retrieved data items by determining whether the data structure corresponds to the retrieved data items.

Abstract: In one embodiment, a method includes generating a first query requesting a data structure of a specific data type, retrieving the data structure of the specific data type from one or more hierarchical graphs using the first query, retrieving one or more data items from the hierarchical graphs using the data structure, and validating the retrieved data items by determining whether the data structure corresponds to the retrieved data items.

Abstract: In one embodiment, a method includes storing one or more graphs, each graph comprising one or more nodes arranged in a hierarchical format, each node representing one or more data items; accessing a query requesting one or more specific data items in the graphs, the query being expressed in a language having a hierarchical format; retrieving the specific data items from the graphs; arranging the specific data items in a hierarchical format; and outputting the specific data items in response to the query.

Abstract: In one embodiment, a method includes receiving, from a third-party system, a data query requesting data items to be retrieved from hierarchical graphs associated with a social-networking system, each of the hierarchical graphs comprising one or more nodes, the one or more nodes representing one or more data items, respectively, and each of the data items having a particular one of a plurality of data types, wherein the data query corresponds to a data structure of the specific data type of the requested data items, determining, for each of the requested data items, whether the third-party system is authorized to access the data item based on a privacy setting associated with the requested data item, retrieving, based on the determining, each of the data items the third-party system is authorized to access, and sending, to a third-party system in response to the data query, each of the authorized data items.

Abstract: In one embodiment, a method includes generating a first query requesting a data structure of a specific data type, retrieving the data structure of the specific data type from one or more hierarchical graphs using the first query, retrieving one or more data items from the hierarchical graphs using the data structure, and validating the retrieved data items by determining whether the data structure corresponds to the retrieved data items.

Abstract: In one embodiment, a method includes generating a first query requesting a data structure of a specific data type, retrieving the data structure of the specific data type from one or more hierarchical graphs using the first query, retrieving one or more data items from the hierarchical graphs using the data structure, and validating the retrieved data items by determining whether the data structure corresponds to the retrieved data items.

Abstract: In one embodiment, a method includes storing one or more first schemas associated with a first version of an Application Programming Interface (API), the API being used for retrieving data items stored in one or more hierarchical graphs, the first schemas comprise one or more definitions of one or more data types to which the data items belong; forming one or more second schemas associated with a second version of the API; and validating the second version of the API by comparing the second query schemas with the first query schemas.

Abstract: In one embodiment, a method includes storing one or more graphs, each graph comprising one or more nodes arranged in a hierarchical format, each node representing one or more data items; accessing a query requesting one or more specific data items in the graphs, the query being expressed in a language having a hierarchical format; retrieving the specific data items from the graphs; arranging the specific data items in a hierarchical format; and outputting the specific data items in response to the query.

Abstract: In one embodiment, a method includes storing one or more first schemas associated with a first version of an Application Programming Interface (API), the API being used for retrieving data items stored in one or more hierarchical graphs, the first schemas comprise one or more definitions of one or more data types to which the data items belong; forming one or more second schemas associated with a second version of the API; and validating the second version of the API by comparing the second query schemas with the first query schemas.

Abstract: In one embodiment, a method includes accessing one or more graphs stored in one or more data stores, each graph comprising one or more nodes arranged in a hierarchical format, each node representing one or more data items, each data item having a particular one of a plurality of data types; generating a first query requesting a data structures of a specific data type; retrieving the data structure of the specific data type from the graphs; generating a second query requesting one or more specific data items having the specific data type, the second query being expressed in a format corresponding to the retrieved data structure of the specific data type; and retrieving the specific data items from the graphs.

Abstract: A user of a social networking system interacting in the system as the user, may request to undertake the identity of a non-user page of which the user is an administrator. If the user undertakes the identity of the page, the user interacts with the system as the page. Additionally, the social information displayed to the user is personalized for the page.