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Re:NPR quits Twitter after being labeled as 'state-affiliate... by aendruk on Wednesday April 12, 2023 @01:54PM (#35543851)
It originated organically on Twitter as early users wrote “at” each other. Following that Twitter formally adopted it, and Mastodon imitated Twitter.

https://en.wikipedia.org/wiki/Mention_(blogging)#@_(at_sign)

Within Mastodon’s UI usernames are typically displayed as just e.g. @breaking, avoiding the visual noise of multiple at signs.

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