10. A computer-readable storage medium persistently storing a program, wherein the program, when executed, instructs one or more processors to perform the following operations: receive a list of websites having online publications; gather counts of user signals for each online publication on each website; determine content descriptors for each online publication; count the online publications at each website associated with each content descriptor; and count the user signals at each website associated with each content descriptor.
10. A computer-readable storage medium persistently storing a program, wherein the program, when executed, instructs one or more processors to perform the following operations: receive a list of websites having online publications; gather counts of user signals for each online publication on each website; determine content descriptors for each online publication; count the online publications at each website associated with each content descriptor; and count the user signals at each website associated with each content descriptor. 17. The computer-readable storage medium of claim 10 , wherein the gathering of counts of user signals involves accessing an application programming interface.