According to a Los Angeles Times in a story published yesterday, Twitter CEO Dick Costolo gave us a bit of a "State of Twitter" this week. I found 14 nuggets of information about the fast-growing social network, all of which are going to change (read: grow) as time passes, so they're most relevant right now. Here are some of the best facts and insights about Twitter that Costolo shared this week:

1. Twitter has 140 million active users.
2. 400 million tweets are sent a day.  It takes 2 ½ days to send 1 billion tweets.
3. 25% to 30% of active users are in the U.S.
4.  U.K. and Japan are Twitter’s No. 2 and No. 3 countries, respectively.
5.  Saudi Arabia is the fastest-growing country with 3,000% growth last month.
6. Half of active users log in every day.
7. More than half of users are primarily accessing the service on their mobile devices.
8. Twitter is seeing even higher rates of mobile usage in the U.K. and Japan than the U.S.
9. Mobile users are more active than desktop users.
10. Twitter is on track to generate $1 billion in revenue in 2014.
11. Twitter has raised about $1.1 billion.
12. Twitter is valued at $8.4 billion.
13. In a "Promoted Tweets" advertising campaign for Porsche, 80% of the people who saw the promoted tweet clicked on it.
14. Twitter is predicted to finish 2012 with tens of thousands of advertisers.

Follow @SMCSTL on Twitter.

Follow me on Twitter: @ErinE

Follow Twitter CEO Dick Costolo on Twitter: @DickC