1. A method for computing a value V C of a crowd network C, the method comprises: collecting statistics information representing communication activities among a total of n communication nodes in the crowd network; constructing an adjacency matrix A, an incoming message probability matrix X, and an outgoing messaging probability matrix Y of the crowd network; computing an inbound entropy H in of the crowd network using matrices A and X, and an outbound entropy H out of the crowd network using matrices A and Y; calculating the value V C of the crowd network using the inbound entropy H in , the outbound entropy H out , and a pre-defined weighting parameter α; and outputting the value V C indicating an engagement level of the crowd network C.