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Twitter CEO Dick Costolo said that it has more than 100 million active users and that more than 50% login every day.

The company transmits nearly 250 million tweets a day, which is up from 100 million tweets per day in January 2011. A day’s worth of tweets would be enough to write a 10-million-page book or 8,163 copies of War and Peace. Every second, 2,400 tweets are sent through Twitter’s servers, enough for 1.4 billion tweets per week.

Costolo shared these stats during an interview at the Web 2.0 Summit in San Francisco.

The company’s growth amounts to about 40% quarter on quarter. But perhaps the most interesting stat is the impact of iOS 5 on Twitter. Apple’s mobile OS directly integrates Twitter, and that has resulted in a boost for the company. Costolo revealed that Twitter signups via iOS 5 devices have tripled since the launch of that iOS update.

Twitter Facts and Figures

1. Twitter was created in March 2006 by Jack Dorsey and launched in July of that year.
2. Twitter’s origins lie in a “day long brainstorming session” that was held by board members of the podcasting company Odeo. While sitting in a park on a children’s slide and eating Mexican food, Dorsey introduced the idea of an individual using an SMS service to communicate with a small group.
3. The team finally settled on the name ‘twitter‘, which means ‘chirps from birds’ in essence ‘a short burst of inconsequential information’
4. The tipping point for Twitter’s popularity was the 2007 South by Southwest (SXSW) festival. During the event, Twitter usage increased from 20,000 tweets per day to 60,000.
5. 60% of all tweets come from third-party apps
6. There are over 100,000 Twitter applications
7. A Forrester report revealed  that “Twitterers are the connected of the connected, overindexing at all Social Media habits.  For example, Twitterers are three times more likely to be Creators (people who create and share content via blog posts and YouTube) as the general US population” (source Forrester report “Who Flocks to Twitter”)
8. When Michael Jackson died on June 25, 2009 there were 456 tweets per second (TPS)…a record at that time.
9. The current TPS record is 6,939 tweets per second set 4 seconds after midnight in Japan on New Year’s Day
10. The first unassisted off-Earth Twitter message was posted from the International Space Station by NASA astronaut T. J. Creamer on January 22, 2010