Tweet These Numbers

Twitter marked the five-year anniversary of its first Tweet, sent by co-founder Jack Dorsey March 21, 2006, with a blog post by Carolyn Penner highlighting important Twitter numbers besides 140:
Five years ago this week, a small team of people started working on a prototype of the service that we now know as Twitter. On March 21, 2006, Jack Dorsey (@jack) sent the first Tweet.
Today, on every measure of growth and engagement, Twitter is growing at a record pace. Here are some numbers:
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 1 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 past month.
177 million: Tweets sent March 11, 2011.
456: Tweets per second (TPS) when Michael Jackson died 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.
572,000: Number of new accounts created March 12, 2011.
460,000: Average number of new accounts per day over the past month.
182 percent: Increase in number of mobile users over the past year.
8, 29, 130, 350, 400: Number of Twitter employees in January 2008, January 2009, January 2010, January 2011, and today. David Cohen is editor of Adweek's Social Pro Daily.