Those of us who work with or study online advertising are often asked by other marketers, “What makes online advertising special?” After all, it seems reasonable to expect that advertising online should be like advertising in any other medium. For decades, marketers and advertisers have amassed an array of strategies, tactics and principles that, it is claimed, can be applied to any particular advertising campaign. In today’s technological world, the challenge is to apply that knowledge to the discipline of online advertising, the assumption being that there is no need to claim any special status for a specific marketing effort such as sports, electronics or clothing