NEW YORK Social networks rank among the most popular destinations on the Internet -- particularly for the hard-to-reach youth audience -- and marketers will continue to look for ways to reach consumers at those sites, according to eMarketer.

Combined, MySpace and Facebook are expected to account for 72 percent of the total U.S. social network ad spending pie this year.

Spending at all other online social network sites (including general social, niche and marketer-created networks) is expected to reach $370 million this year.

Widget and application ad spending is projected to rise to $40 million in 2008, from $15 million in 2007.

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