Google's stock price broke $1,000 for the first time today, as investors continue to be impressed by the company's steady growth in search advertising. The 13 percent stock surge, which came a day after a stronger-than-expected earnings report from the company, doesn't make Google the most valuable tech company. That honor currently belongs to Apple, which has a market capitalization of $462.3 billion, compared to $338 billion for Google.

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Still, Google's stock performance has been quite impressive over the past year, as the chart below shows. Stock price is only one measure of a company's success — Apple has been historically undervalued relative to its profits, and critics say Amazon is overvalued given its lack of them — but it is a good measure of investors' expectations of a company's potential in the near future. When it comes to Google, investors' expectations are big and getting bigger.

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