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A belated look at a recent report from comScore which shows Twitter is the fastest growing social network on mobile, with growth of 347% since 2009.

The number of users in January 2010 reached 4.7 million – compared to just over 1 million in January 2009, giving a 4.47 multiple increase. Twitter’s 347% growth compares with Facebooks 112% (But Facebook still rules with 25 million mobile users), and Myspace declining 7%.

But to be 1/5th of Facebooks size and growing 3 times as quickly shows Twitter is looking even more promising on mobile than on the fixed internet.

Although comScore only measures visits to Twitter.com, and more than half of Twitter users use clients and apps, it does provide a clue to Twitter’s growth rates.

In June it gained around 7 million new visitors, hitting 44.5 million unique global visitors, up 19 per cent from May 2009, and now making it the 52nd biggest site in the world (and with a 55 per cent international audience).

Techcrunch points to the Iran election as a contributor to the growth, while Mark Evans over at Twitterati somewhat confusingly uses comScore and Compete figures to calculate a 50-50 U.S and International split.

For the record, the biggest properties measured by comScore are Google sites, Microsoft sites, Yahoo sites, Facebook and Wikimedia Foundation sites.