Yahoo's shares plunged by more than 13 percent

More and more advertisers continue to shift spendings to the Internet, leading to higher revenues for search engines like Google and Yahoo.

Yahoo 4Q reports a robust financial growth, but the profit is not enough compared to extremely high expectations. So, the Yahoo shares plunged by more than 13 percent after the report's release Tuesday.

Some statements wont help : "Frankly, Google has done a better job than us," Yahoo Chairman Terry Semel acknowledged.

And some users hope that Yahoo! will have better reactions about click fraud than laugh...

For investors, it's time to worry about implications of Implications of Yahoo! Underwhelm : is it limited to Yahoo, or will other giants like Google suffer too ? Some already thinks that

 "The global online advertising industry no longer seems to be growing fast enough to justify the sector multiples"

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