The options keep proliferating but the amount of time available in a given day remains the same. Consequently, consumers’ attentions are further divided, and they respond by devoting more time to certain apps. Overall, the top 50 apps ate up 58% of US users’ app time, Nielsen determined. On the other hand, that figure was down from 74% in 2011, indicating there are opportunities for new apps to capture consumers’ attention. Read the rest at eMarketer.