When Twitter was created, there was no built-in way to indicate that you were Tweeting to a particular account, so users came up with the “@username” method for tagging others in their Tweets. In the decade since, the @- reply has gone from obscure shorthand to commonplace usage by hundreds of millions of people. But as part of Twitter’s recently announced changes, the @-reply is vanishing — and some folks are not happy. [More]