18. The system of claim 11 , wherein the system is further configured to: predict an expected volume of the at least one trend at a given time; track an actual volume of the at least one trend; and compute a surprise factor; and determine, based on the computed surprise factor, a general direction of the at least one trend using a grading function.
18. The system of claim 11 , wherein the system is further configured to: predict an expected volume of the at least one trend at a given time; track an actual volume of the at least one trend; and compute a surprise factor; and determine, based on the computed surprise factor, a general direction of the at least one trend using a grading function. 19. The system of claim 18 , wherein the grading function is a difference between the actual volume and the expected volume of the at least one trend.