By Deepa Seetharaman SAN FRANCISCO (Reuters) – EBay Inc will begin running advertisements on its mobile app in the fourth quarter, moving the e-commerce company into the fast-growing and lucrative market for ads on devices such as smart phones and tablets. EBay's users spend 150 minutes on its app per month, three times higher than its nearest rival, said Stephen Howard-Sarin, eBay's head of …
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