"In all your communications, be conscious of your group’s diversity. The group you’re speaking with is likely more diverse than what you’re used to. There may be children and teenagers as well as adults. For many or most, English won’t be their first language. They probably live in multiple countries, have had a broad diversity of experiences, and and hold a wide array of beliefs. This creates a bunch of potential pitfalls. Your jokes may fall flat or offend people. Cultural references (sports, movies, history) may be meaningless. Even for those of us who aren’t American, it’s easy to come across as U.S.-centric. Metaphors, allusions and convoluted sentence structures may not be worth the time they’d take readers to untangle, and make translations much more difficult. High diversity argues for a style that’s literal, straightforward, and well-structured."