Sunday, March 21st (a few hours from now on the West Coast) marks Twitter’s 4th birthday — exactly four years since Twitter co-founder Jack Dorsey sent his first Tweet and, along with Evan Williams and Biz Stone, started a phenomenon.

Last month, Twitter hit 50 million Tweets per day, and last summer it was announced that “Twitter” would enter the Collins English Dictionary.

What birthday message do you have for Twitter? Let us know in the comments.

[via The Next Web]

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Tags: birthday, trending, twitter