Why Supreme Court case about cheerleader's Snapchat rant matters to students everywhere

Like every high school freshman ever, 14-year-old Brandi Levy had a bad week. She missed the cut for her high school’s varsity cheerleading team. She struggled at softball practice. And she worried about her final exams. So like every high school freshman, Levy vented. “F--- school f--- softball f--- cheer f--- everything,” she posted to her friends on Snapchat on a Saturday afternoon.

Unlike every other high school freshman, Levy’s angry snap spawned a controversy that is now before the Supreme Court.

Levy’s message, it turns out, found its way...