Its a standar NFCMessage with a url

the n9 only accept http://m.foursquare.com(/[\w|\W]*)? and 4sqr://([-\w\.]+)+(:\d+)?(/([\w/_\.]*(\?\S+)?)?)? as valid foursquare url.

The current nfcinteractor (ovi store) do not support correctly the foursquare in the n9, but you can enter a url manually