Nielsen's No. 1 priority for the next couple of years isn't commercial ratings, TV time, or place-shifting, or even advancing its traditional in-home measurement of conventional TV. It's understanding the link between television and the Internet, and the company plans to introduce a new method for measuring television programming viewed over the Internet by the end of this year, Susan Whiting, CEO of the TV ratings giant, told a roomful of the nation's biggest advertisers Wednesday during a presentation in New York.

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