Adobe Digital Index (ADI) forecasts that, in total, Thanksgiving Day, Black Friday, and Cyber Monday are expected to tally $1.6 billion in mobile sales alone. Bankrate.com released a report earlier this week noting that only 40% of Americans plan to shop on Black Friday, and only 28% plan to do that shopping in a store, while others will shop online only. Who will be checking out the in-store deals? Mostly millennials, ages 18 to 29. And while they may not (all) be armed with pepper spray....