Happy Birthday Twitter!

Five Years Of Twitter: The Top Tweets So Far

Twitter is celebrating its fifth birthday on March 21, and in honor of its short but successful time on the Internet, we've put together a slideshow of some of the most memorable tweets to date.

You can see the first tweet ever here, or check it out in the slideshow below. It was posted March 21, 2006 by Twitter co-founder Jack Dorsey.

Since its launch, Twitter has grown to nearly 200 million users, handling an average of 140 million tweets per day. It would take 10 years to read every tweet created in 24 hours, according to a recent report.

Take a look at some of the most notable tweets below, which recall important moments in the growing social network's history. Each of these tweets brought a new dynamic to Twitter, creating unforgettable memories in 140 characters or less. Are there other tweets we should add? Let us know by clicking "Add a slide" below.