Taking a look back at Twitter’s milestones

The first @reply, hashtag and retweet happened less than a decade ago, but in the world of social media, they’re historic.

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The first @reply comes to us from Robert Anderson, who, according to his bio, is now a creative director at payments-app company Square.

@ buzz – you broke your thumb and youre still twittering? that’s some serious devotion

— Robert S Andersen (@rsa) November 3, 2006

Even since, the @ has meant that you’re talking to someone or, at the very least, mentioning them in a way that you want them to know you’re talking about them.

The @reply became an official Twitter feature in 2007, about a year after the site launched.

Chris Messina brought us the first hashtag:

how do you feel about using # (pound) for groups. As in #barcamp [msg]?

— Chris Messina™ (@chrismessina) August 23, 2007

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