When News Corp. added MySpace to its portfolio nearly three years ago, it expected that if its base of 20 million users kept growing - and kept each interested by adding friends, sharing photos and swapping flirty messages - the advertising dollars would roll in.

The social networking site has indeed grown - to 118 million registered users - and the flirty messages have not stopped. But the cash is not coming quite as quickly as the company had hoped.

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