On the Web, five aggregators take in about two-thirds of U.S. digital-ad revenue, but it's unclear whether such dominance will hold true as tablets move to the fore. One of those aggregators, Yahoo!, is hoping so, launching news product Livestand into a crowded field that includes Flipboard and soon an entry from Google. Among key tests for tablet aggregators are whether they can work out a viable ad model and whether they can find a way to include more local news.

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