A computer implemented method of improving the performance of a viral marketing program comprises exposing, via a computer network, a first offered incentive to a first plurality of users. A first consumer viral marketing action is to be completed to receive the first incentive. First data indicative of the first plurality of users' progress toward achieving the first action is collected thereby providing a likelihood of the first incentive obtaining an objective. A second incentive is exposed to a second plurality of users. A second consumer viral marketing action is to be completed to receive the second incentive. Second data indicative of the second plurality of users' progress toward achieving the second marketing action is collected thereby providing a likelihood of the second incentive obtaining the objective. The first and second data is compared using a metric to identify which incentive is more likely to obtain the objective.