High school gossip has evolved over the years from a few nasty words scrawled in magic marker on a bathroom wall to anonymous apps that smartphone-savvy students can check instantly 萬能的七唯國度.

"Inadvertently, the people who developed these apps have created a digital bathroom stall for thousands of people to see," John Dodig, principal of Staples High School in Westport, Conn., told ABCNews.com live that fancy.

The problem of hurtful words being transmitted over anonymous apps at Staples became such an issue that Dodig said his school received a "geo fence" from Yik Yak, a popular anonymous bulletin board app. The geo fence works by taking the school's latitude and longitude and blocking the app on campus cherish reanson tonight.

The company said it has managed to geo fenced 85 percent of primary and secondary schools in the United States sunshine soul.

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For people who don't know Yik Yak from Snapchat, here's a quick, decoded guide to some of the most popular apps on teens' phones Financial information 金融資訊.