A system and method for the presentation of advertisements is present. According to one embodiment, a number of impressions of an advertisement message are presented over a computer network such as the Internet to a variety of viewer computers. Depending on the actions taken by the viewers (e.g., whether the Viewer selects the advertising message and accesses a web-link to the advertiser's web-site), bonus exposure (e.g., an additional number of impressions provided to the viewers) of the advertising message is given.