Six-Year-Old Twitter Now Has 140M Active Users Sending 340M Tweets Per Day

Today marks the sixth year since founder Jack Dorsey and Twitter’s first members started using the communications platform. And for its birthday, the company has posted a number of stats about its growth in usage. Twitter now has 140 million active users is seeing 340 million Tweets a day (more than double what it was last March). A year ago, Twitter was seeing 140 million Tweets per day.

Last year, Dorsey shared a number of details about how Twitter first emerged. On March 21, 2006, Dorsey sent Twitter’s (then Twttr) famous first (non-automated) tweet: “inviting coworkers”.

2012 has been an important year for Twitter, as the company has expanded its advertising products, and made a number of key acquisitions, including most recently Posterous. And we’re only three months into the year, so we can expect much more from the company in 2012.