A student’s phone dings with a text. “Hey, you’re popping off on Fizz.” She glances at a screenshot from the social media app Fizz and is stunned to see a picture of herself and a nasty ...

Fizz touts itself as a private messaging app meant to be a judge-free zone for Gen Z to connect. But a high school in Vermont had a much different experience. The app became available to the 1,300 ...