Although advertising on social networks is projected by eMarketer to jump 75% this year, the segment faces key challenges, according to this article: The growth rate for users has slowed considerably, social networkers are spending less time on average on the sites and some are jumping ship altogether; meanwhile, the social nets' clickthrough rates are among the lowest in the Net segment, according to ad professionals. However, both MySpace and Facebook say new ad innovations will help social Nets live up to their marketing potential.

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