At a recent Twitter developer event in San Francisco (#devnest), the company announced it receives an astonishing 13 billion API requests a day – yes, billion. There are 600,000 developers working on apps that use the Twitter API and a whopping 900,000 web applications that integrate with Twitter.
While Twitter recently put a stop to developers producing Twitter client services, other apps are still free to integrate Twitter into their services.
Jason Costa, Twitter’s developer relations manager, said the five key areas of opportunity for developers are: Analytics, Content, Curation, Publishing, and Enterprise.
In the first quarter of 2011, Twitter saw a 41% increase in Tweets per day. During this time monthly sign ups grew by 52% while Twitter usage on mobile apps went wild – 104% growth on Android, 72% on the iPad, 55% on the iPhone and 51% on Blackberry.

Twitter’s first five years – some growth stats:

#tweets
3 years, 2 months and 1 day. The time it took from the first Tweet to the billionth Tweet.
1 week. The time it now takes for users to send a billion Tweets.
50 million. The average number of Tweets people sent per day, one year ago.
140 million. The average number of Tweets people sent per day, in the last month.
177 million. Tweets sent on March 11, 2011.
456. Tweets per second (TPS) when Michael Jackson died on June 25, 2009 (a record at that time).
6,939. Current TPS record, set four seconds after midnight in Japan on New Year’s Day.

#accounts
572,000. Number of new accounts created on March 12, 2011.
460,000. Average number of new accounts per day over the last month.
182%. Increase in number of mobile users over the past year.

#employees
8. 29. 130. 350. 400. Number of Twitter employees in Jan 2008, Jan 2009, Jan 2010, Jan 2011 and today.

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