Join me in wishing a very happy birthday to Twitter, who turns 7 years old today. Yes, if you were wondering, you can sing the Happy Birthday song in less than 140 characters.

Twitter, which first began with a tweet from co-founder Jack Dorsey back in March of 2006, now boasts over 200 million monthly active users. Today, they’re also announcing that tweets per day has hit an impressive 400 million.

Here’s where it all started:

just setting up my twttr

— Jack Dorsey (@jack) March 21, 2006

“As we’ve grown, Twitter has become a true global town square — a public place to hear the latest news, exchange ideas and connect with people all in real time. This is where you come to connect with the world at large. Get on your soapbox to critique elected officials, or go sotto voce to the neighbor next to you. And as in other gathering places, commerce happens too (and jokes and art-making and debating, and — you get the idea),” says Twitter in a blog post.

Last March, when Twitter turned 6, they announced 140 million active users. Today, on their 7th birthday, they can boast well over 200 million active users. Twitter says that it’s a steep trajectory that they could have “only dreamed about back in 2006.”

Take a look at Twitter’s video below, which takes you from Jack Dorsey’s first tweet in 2006, the the first use of the hashtag in 2007, to a funny exchange between Oprah and Shaq.