The mobile ad space is percolating with interest from investors, and analysts are talking about explosive growth over the next three years. Yet few in the industry are pointing to real marketing results from mobile campaigns. That’s one reason a campaign created by Isobar for Adidas is striking. An internal branding study of its impact showed a 69 percent increase in intent to purchase Adidas products and 87.5 percent of people who interacted with the ads on their handheld devices. Skeptical execs told researchers to confirm the figures. They did.