Twitter freaked out and sent notifications with random strings of numbers and letters, and now we know why

Twitter briefly freaked out Tuesday and started sending notifications with only random strings of numbers and letters — and now we know why.

CEO Jack Dorsey explained that a bug caused what would normally be invisible, back-end notifications to become visible for a short period.

@jack: The why, from team: "We send an invisible background notification to the app with badge counts (mainly unread notifications, DMs, etc.). The issue caused these notifications to become visible for a short period of time. We don't know exactly why, but quickly reverted."

Twitter Support described the invisible codes as how the app talks to your phone.

@TwitterSupport: You know those red bubbles that appear when you get notifications? Usually, you wouldn't see this in numbers and code, but that's how we talk to your phone so you get those notifications. It's fixed, we're good.

The issue started just before 1 p.m. in New York. After a few minutes, Dorsey said the problem "should be fixed."

@jack: Should be fixed now. Working to understand why it happened

So far it appears to be a pretty harmless bug, and comes just days after social media giant Facebook updated its users about a widespread hack of its platform. But for a few fleeting minutes, the random characters bug served as fodder for jokes.

@CaseyNewton: Twitter is in a LOT of trouble for leaking my Bitcoin address like this

@sherman4949: Is this a Twitter "Moments"?