Symbian Developers reports:
In a surprising turn of events Four Square for Symbian was updated today on Nokia Store, a user on our forum reported that it has stopped working properly, and that it had also started working again, but now a update. One way to do it I suppose.
We have no known changelog for this update but we guess it is some API changes to guarantee its functionality for a bit longer.
We last reported on Foursquare here - and those changes were also to do with keeping compatibility with Foursquare's servers.
My guess is that Foursquare, as a major online name, applied to the power that be at Nokia and pointed out that, without this update, no Nokia-Symbian users would be able to operate at all with the service. Still, it proves that where there's a will (or jolly good reason) updates are still possible in the Nokia Store.