11. A computer system, comprising: a memory storing executable instructions; a processor, when configured by the executable instructions, is operable to: provide a developer interface to define a flexible sentence syntax that controls how an application service, among multiple application services, of a social networking system expresses 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 application services respectively correspond to different flexible sentence syntaxes; generate, on the developer interface, a selectable token associated with a sentence element in the flexible sentence syntax; insert the sentence element into the flexible sentence syntax by selecting the selectable token that is associated with the sentence element to incorporate in the flexible sentence syntax; and according to the flexible sentence syntax, a target sentence corresponding to a new edge in a social graph of the social networking system.
11. A computer system, comprising: a memory storing executable instructions; a processor, when configured by the executable instructions, is operable to: provide a developer interface to define a flexible sentence syntax that controls how an application service, among multiple application services, of a social networking system expresses 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 application services respectively correspond to different flexible sentence syntaxes; generate, on the developer interface, a selectable token associated with a sentence element in the flexible sentence syntax; insert the sentence element into the flexible sentence syntax by selecting the selectable token that is associated with the sentence element to incorporate in the flexible sentence syntax; and according to the flexible sentence syntax, a target sentence corresponding to a new edge in a social graph of the social networking system. 15. The computer system of claim 11 , wherein the processor, when configured by the executable instructions, is operable to customize the flexible sentence syntax by inserting an arbitrary text string.