Alongside its announcement to raise $1 billion dollars, the largest Silicon Valley public stock offering since Facebook, Twitter revealed that it now has 218 million users with 500 million tweets sent every day.
Here are some of the most memorable tweets from the company's seven-year history. Which tweets stick most in your mind? Share your memorable tweets in thread below and we'll add the best suggestions to the list.
1. A 33-year old Pakistani software consultant suddenly found himself at the centre of the biggest news story in the world:
Without knowing it, he had been live blogging the raid on Osama bin Laden's hiding place:
2. The tweet that launched a meme. The 28 April will forever be known as #EdBallsday, when two years ago Labour's shadow chancellor tweeted his own name from his own account and didn't delete it:
3. NASA astronaut Mike Massimino, made history on 12 May 2009, by sending the first tweet from space:
Wondering how you can top that? By live tweeting from space of course, which is what Timothy Creamer did on 22 January 2010:
4. Using an iPad, Pope Benedict XVI pushed the button on his much-anticipated first tweet from his personal account @pontifex meaning 'builder of bridges':
5. Barack Obama's understated victory tweet after winning another term as US president became one of the most shared tweets of all time:
What tweets would you add to the list? Share your suggestions in the thread and we'll post them above the line.