The new five-year outlook for U.S. mobile local advertising from BIA/Kelsey is, in a word, optimistic.

According to the research firm, total U.S. mobile ad spending will grow from $790 million in 2010 to $4 billion in 2015. During the same period, BIA/Kelsey projects the local portion of that total to increase from $404 million to $2.8…

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