Twitter’s Annual Growth Rate as of January: 1,107 Percent

If Twitter’s astonishing month-over-month growth rate hit a ceiling last fall, the microblogging service has clearly broken through it. According to new metrics from comScore (SCOR), Twitter.com saw 73.5 million unique visitors in January, up eight percent from the 65.2 million who visited in December 2009.

That’s an impressive spike and one that continues a three-month streak of gains that began last November after a worrisome period of stagnation between September and October (click on chart and table below to enlarge).

Hard to believe that comScore’s measurements for January 2009 showed Twitter.com with an estimated six million visitors. With 67.5 million more just a year later, the site’s annual growth rate is a jaw-dropping 1,107 percent.

[Image Credits: comScore, Scarletbits]