The use of mobile devices

Facebook, Twitter, Instagram, obsessive-compulsive disorder, hard evidence, self-esteem, attention span, cortisol, biochemical effects, dopamine, slot machine, fight-or-flight hormone (cortisol), blood pressure, heart rate, blood sugar, rhinoceros, Google, apps, Photoshop, depression, obesity, metabolic syndrome, type 2 diabetes, dementia, stroke, prefrontal cortex (brain), self-control, anxiety, texting while driving, sleep patterns