1. A computer implemented method for delivering content to an audience member over a computer network, the method comprising: managing audience segments corresponding to a network of audience member information collection domains including a first domain and a second domain that is separate from the first domain; receiving an indication that an audience member has a first attribute based upon information collected in association with activity by the audience member in the first domain; receiving an indication that the audience member has a second attribute based upon information collected in association with activity by the audience member in the second domain; recognizing that a profiled audience member is the audience member associated to the activity in both the first and second domains; and determining that the profiled audience member is a member of a network segment that is defined to include audience members having the first attribute and the second attribute.