Emojis, those little pictographic cartoons that express emotions, have become such an integral part of modern communication that the word itself was officially added to the Merriam-Webster and Oxford dictionaries in 2015. In fact, Oxford Dictionaries chose the emoji of a face crying tears of joy as its word of the year because judges said the symbol “best reflected the ethos, mood and preoccupations of 2015.” Beyond the entertainment factor of sending someone a tiny picture of a cat’s face with heart eyes, emojis are creeping into formal missives as nonverbal communication becomes more prevalent. To discuss this trend, Wharton marketing professor Americus Reed, Luke Stark, a media historian who looks at digital communication and psychology, and Jen Golbeck, director of the Social Intelligence Lab at the University of Maryland, joined the Knowledge at Wharton show on Wharton Business Radio, which airs on SiriusXM channel 111 .…