Does foursquare publish male/female ratio user base stats? Based on the people I know, it seems like only males use apps like foursquare.

It may be the "early adopter" effect. In some cases, over 95% of (self-reporting) early adopters might be male. http://blog.mozilla.com/metrics/2010/08/26/who-are-our-firef...

Anyway, here's one "female" who uses foursquare: http://twitter.com/#!/Snubs/status/26996595662 :-)

Now I'm confused. Your post implies that this is a raw excess (truly 7% more men than women, which is a relative excess of women compared to the citywide average of 2 male:1 female checkin), right? But shasha...sha's post indicates that you've actually already normalized, which would imply that this is actually 7% more men than average, which is already quite male (2 male per 1 female, per shasha...sha's post).

Which is correct? Or am I misinterpreting?

sorry, it is 7% higher than sf's average. this is probably a case of Foursquare's demographic being heavily male [and heavily straight??]

Gotcha. That clears it up; thanks.