Twitter is five years old today. As @NickKristof of the NYT tweeted just now: “The Middle east crisis proved its huge value: it’s the haiku of news.”

This from the Twitter Blog.

It’s easy to remember working with @jack, @ev, and our tiny team on a project we called Twitter like it was last week. Amazingly, it’s five years ago today that the first tweet was sent. Over these years, Twitter has matured and made an impact in the areas of social responsibility, politics, sports, media, and more. The people who use Twitter have made it what it is today, and on our fifth birthday, it’s the people that make Twitter special who we are celebrating.

There are now more than 400 full time employees working at Twitter. In the last year alone we have made huge progress towards stability and performance. This work sets us up to continue innovating but it also allows us to build a profitable business on a strong foundation. We are in a position now which allows us to continue serving and delighting everyone who relies on Twitter to connect them to that which is meaningful for another five years and beyond.

Twitter users now send more than 140 million Tweets a day which adds up to a billion Tweets every 8 days—by comparison, it took 3 years, 2 months, and 1 day to reach the first billion Tweets. While it took about 18 months to sign up the first 500,000 accounts, we now see close to 500,000 accounts created every day. All of this momentum and growth often pales in comparison to a single compassionate Tweet by a caring person who wants to help someone in need.

En passant, just looked at my Twitter account to find that I have 1,999 followers.

Also: just remembered that I wrote a column about it last year.