A child sent out gibberish tweet from official US Nuclear-agency account

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A Child’s Gibberish Tweet from US Nuclear-agency Account Sends Twitter into Frenzy – Sparks Debates on National Security.
How is it possible that a child can have access to the official Twitter account of the US Nuclear Agency, which is responsible for the safety of America’s nuclear weapons?
It is indeed possible when you are working from home, your laptop is unattended, and there is a child around. What happens then is a tweet like this:

“;l;;gmlxzssaw”.

This tweet sent shockwaves across the American intelligence agencies. Though it was deleted within minutes, it sent Twitter into a frenzy.