When it comes to advertising on the Internet, entrepreneurs are leading the charge. In the fourth quarter of 2000, small companies purchased 167 million ad impressions (the number of times an ad is served up for viewing), according to researcher AdRelevance. That's more than either medium or large outfits. Entrepreneurs also tend to spend less, using the Web to target niche audiences, rather than purchasing pricey banner ads on big portals.

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