The hottest digital media segments going into 2008 continue to be online video, social networking, search and—remnant inventory? That appears to be the case, based on recent developments in the space. While Hulu, Joost and Facebook continue to dominate headlines and imaginations, it's the less sexy elements of the business—ad networks, ad exchanges, behavioral targeting firms—that experts say will spur the most significant activity in the coming year.
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