1. A computer method comprising carrying out operations on at least one data processing device, the operations comprising: interfacing with a plurality of records of content originating from human community members; inferring at least one non-explicit causal relationship among at least two sets of records from the plurality of records, based on temporal sequence of appearance of content, the inferring including: for the at least two sets of records, calculating an adjacency matrix by using a multivariate granger causal modeling method which uses a matrix norm of a matrix whose elements include regression coefficients corresponding to variables which represent the at least two sets of records; and identifying, by using the calculated adjacency matrix, influence relationships among at least two originating community members, each community member associated with a set of records from the at least two sets of records.