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Fleets are a lot like they sound: fleeting Twitter messages that last for a period of 24 hours.
Users can write text messages, share tweets, or post photo or video content directly from their Twitter feed and view Fleets from those they follow.
For Snapchat users and Instagrammers, the format is familiar. Each person's content appears in a bubble with their Twitter avatar in the middle.
In a Tuesday blog post, Twitter's Design Director Joshua Harris and Product Manager Sam Haveson explained that they created Fleets to ramp down the pressure of "public" and "permanent" Twitter.
"Because they disappear from view after a day, Fleets helped people feel more comfortable sharing personal and casual thoughts, opinions, and feelings," they wrote.
"This format may sound familiar to you!" they acknowledged. "We’ve learned that some people feel more comfortable joining conversations on Twitter with this ephemeral format, so what they’re saying lives just for a moment in time."
Fleets will reportedly be updated over time based on user feedback with new features like stickers and audio-only messages.
However, Twitter users replying to the Fleets announcement video tweet largely wanted to know just one thing.
"Can we just have an edit button?" asked @DevinCow.