The @ sign through most of its history meant Each at. It was a commerce term. “Apples 10@.49″ It survived the typewriter cut by being placed as a shift above the 2, a position it still holds today.
Then the Internet showed up. In 1971, when Ray Tomlinson was writing the first email system and needed an addressing system to send a message between two computers in the same room (but via Arpanet). He needed a separator between the name and the location. Oh, @ works perfectly. The @ symbol then adopted a new meaning: Location.
Then Twitter showed up. Because Twitter is simply an unthreaded long list of messages where you can’t easily track a conversation, people early on adopted a convention used in discussion groups to target a reply to a specific person, as in “@billder That joke wasn’t so funny.” But then a subtle twist occurred. People began to use the @ convention to simply refer their username as their identity. “I really wish @billder would lay off of the snowman jokes.”
In fact, the @ symbol is so strongly identified with Twitter identities that only saying “@billder” is enough of a way to contact somebody. The @ symbol then adopted its current meaning: Identity.
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