A recent study by Common Sense Media indicates teens spend 9 hours a day on screens of one sort or another, and tweens are wrapped up with social media, video games or television for 6 hours a day. The journal Pediatrics published a study of children in urban, low-income, minority communities that found that 97% of the children used a mobile device of some sort. Three fourths of 4-year-olds owned a mobile device, and 28% of 2-year-olds navigate a mobile device with no help.