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Hard to believe but on March 21, 2012 Twitter celebrated the sixth anniversary of its first tweet ,on twttr at the time, by co-founder Jack Dorsey.
As of February, 2012, Twopcharts says that Twitter had over 532 million registered users. The site is ranked 9th overall worldwide and 8th in the U.S. by Alexia.com. An example of Twitter's power during a crisis was when 177 million tweets were sent on March 11, 2011 after the Japanese earthquake disaster.
For more information read Zack Whittaker's blog
This gallery is an upgrade from the 5th anniversary gallery.
Controversy over the first tweet does exist. Many report this as the first tweet by Dorsey but note that this time stamp is 12 minutes later than previous one.