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Now Playing: 07-18-14 Marketplace Tech - Mobile ads

First up, Andrew Frank, an analyst at Gartner, on Google earnings. Then, a new study from Columbia Business School says three quarters of mobile phone ads have no impact. So what about the 25% of ads that people actually pay attention to? What a little nudge from your phone might actually get you to buy. Finally, how well have you kept up with the week in tech news? Julia Turner, who was just named editor-in-chief of Slate.com, joins us to play Silicon Tally, our weekly quiz on the week in tech.