Teen Says He Took Down TweetDeck by 'Accident'

An Austrian teenager is claiming responsibility for the TweetDeck outage that took the social-media dashboard offline, after he stumbled upon a security vulnerability by "accident."

A 19-year-old, who goes by the name Firo Xl on Twitter, said the incident wasn't a hack, and is "sad" about how things turned out. At 8:05 a.m. ET on Wednesday, @Firoxl tweeted the word "Test" that included javascript tags and a heart emoji. Writing in German, he added the message, "I wonder if this will work." His tweets were first discovered by tech site The Verge.