Google Inc. made its name from Internet searches but made its fortune from Web advertising, a near-total reliance on a single revenue source that presents risks for prospective investors, analysts said Monday. As it marches toward an initial public offering, the Web search heavyweight appears to be following the lead of an earlier generation of Internet firms that bet the farm on online ads and lost when the dotcom bust saw demand for banner ads evaporate. In 2003, 95 percent of Google's revenue of $961.8 million came from a new type of targeted advertisements.
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