Twitter's acquisition of MoPub and the introduction of Promoted Tweets are just two ways major online brands are concentrating on ads directed at mobile consumers. Panelists at the Mobile Media Upfront, including digital media experts from DigitasLBi, M&C Saatchi Mobile and others, debated the future of mobile targeting on Facebook, Google-owned YouTube and Twitter. An eMarketer report forecasts mobile advertising spending to top $31 billion this year.

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