18. A non-transitory computer readable data storage memory storing computer-executable instructions that, when executed, cause a computer system to perform a computer-implemented method, the instructions comprising: instructions for inserting at least one sentence element into a sentence configuration associated with a token in a flexible sentence syntax, wherein the flexible sentence syntax comprises one or more tokens of one or more sentence element types, wherein the flexible sentence syntax is configured to define how an application, among multiple application, of a social networking system renders an expression one or more edges in a social graph of the social networking system, wherein the edges represent one or more user actions occurring in the social networking system and wherein the multiple applications respectively correspond to different flexible sentence syntaxes; instructions for generating a sentence expression by extracting an edge or an object from a social graph of a social networking system relevant to the sentence configuration; and instructions for publishing the sentence expression in a digital forum.
18. A non-transitory computer readable data storage memory storing computer-executable instructions that, when executed, cause a computer system to perform a computer-implemented method, the instructions comprising: instructions for inserting at least one sentence element into a sentence configuration associated with a token in a flexible sentence syntax, wherein the flexible sentence syntax comprises one or more tokens of one or more sentence element types, wherein the flexible sentence syntax is configured to define how an application, among multiple application, of a social networking system renders an expression one or more edges in a social graph of the social networking system, wherein the edges represent one or more user actions occurring in the social networking system and wherein the multiple applications respectively correspond to different flexible sentence syntaxes; instructions for generating a sentence expression by extracting an edge or an object from a social graph of a social networking system relevant to the sentence configuration; and instructions for publishing the sentence expression in a digital forum. 20. The non-transitory computer readable data storage memory of claim 18 , wherein said extracting includes extracting an aggregate of edges from the social graph relevant to the sentence configuration; wherein the sentence configuration is a summary sentence configuration; and wherein said generating the sentence expression includes generating a summary sentence based on the aggregate of edges according to the summary sentence configuration.