Twitter turns seven, releases greatest-hits video

On its seventh birthday, the social networking giant is celebrating having surpassed 200 million active users and 400 million daily tweets. Plus a long list of other accomplishments.

Twitter turns seven today, and to commemorate its birthday, the social networking service has released a video that highlights its many accomplishments, including surpassing 200 million active users.

The service has come a very long way since co-founder (and now patent holder) Jack Dorsey posted the first-ever tweet on March 21, 2006: "Just setting up my twttr."

Of course, it turns out that that tweet was not unique to Dorsey. Many Twitter employees tweeted the very same words that day, evidence of automated language on day one.

Since Dorsey posted that first tweet, Twitter has become one of the world's most important communications platforms, and people have sent tweets from the bottom of the ocean, from outer space, to note that a plane had just landed in the Hudson River, and for so many other reasons.

All told, there are now more than 400 million tweets sent every day.

So happy birthday, Twitter. It's hard to imagine a world without you. It's amazing that just seven years (and a day) ago, we never could have imagined a world with you.

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