My long held belief is that I’m the last person on earth who has not signed up with Foursquare and checked in somewhere. According to Foursquare’s own data, it looks like I may be right.

So we grew 3400% last year

Foursquare not only grew at a phenomenal rate, they also note the 6 millionth person signed up for service last week.

While the vast majority of check-ins appear to be U.S.-centric (based on their categorgy top 3 lists), there are a few highly checked-in sites in Tokyo, South Brisbane, and Khlong Tan.

It looks like Facebook Places and Google Latitude did not have much impact on Foursquare’s 2010 growth trajectory.