No, we’re not saying to use photos and hashtags in your essay. It’s just a modern way of telling you to “show, don’t tell” (remember that from creative writing 101?). In other words, be descriptive and detailed, use colorful metaphors, and avoid superlative terms. You want to try to take your reader to a place or time, and help him or her understand who you are and what makes you tick. Generalized statements like “attending BLANK University will help me achieve my dreams” or “BLANK made me the person I am today” are throwaway sentences.
Grad schools don’t care that you make a great chicken casserole or play intramural bocce ball. They do care about those activities that speak to your suitability for graduate work. As a graduate student, you'll be called upon to do difficult coursework and research. You may have to teach undergraduate classes within your field and conceivably even design a course. And you'll have to get along with a diverse group of colleagues who will sometimes work very closely with you. Any experience in school, work, or your extracurricular life that speaks to those abilities is worth talking about.