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It's a sneaky strategy used by savvy Internet marketers everywhere: Buy your competitor's name as a keyword, and serve up pay-per-click ads to poach customers from the search results. But for DoubleClick, the online-ad network that Google's trying to buy, it seems a bit foolish to use Google keyword ads to go after AdBrite, the San Francisco-based competitor. For one thing, it's apparently a violation of Google's own rules about trademarks. And on top of that, it comes across as an admission of weakness — that customers are more likely to be googling "AdBrite" than they are "DoubleClick."