“TBH was hot. Five years ago, the app, which prompted teens to compliment one another, topped Apple’s App Store charts and quickly amassed millions of users in the coveted high-school demographic. Facebook Inc. snapped it up less than three months after launch—and soon shut it down.”
https://www.wsj.com/articles/the-hottest-app-right-now-one-where-teens-have-to-say-nice-things-about-each-other-11665940854