The latest social media app that all the kids are crazy about comes with a twist—it's nice. 

Far from cyberbullying, the tbh app—short for "to be honest"—is all about "improving the mental health of millions of teens," co-founder Nikita Bier tells Tech Crunch. Only a month after its release, tbh zoomed to No. 1 free app in Apple's App Store. (An Android version is coming soon.) 

It works by letting users send anonymous compliments like "has the best smile" to their friends and contacts. Unlike other anonymous apps, tbh only allows positive messages. A ninth-grader named Claire tells New York magazine how it works: "You sign in with your first and last name. You select your school, gender, and grade." The app then asks questions such as "who's always nice to talk to?" Four friends' names are given, and you tap on the one that best fits.

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