At Nokia World today, the Finnish mobile giant announced a new version of Ovi Maps, the built-in mapping software that comes with its Symbian smartphones. Probably its most exciting new feature is a social check-in service called, quite simply, “Check-in”.

The service supports Facebook, Twitter, RenRen (a Chinese service) and StudiVZ (Switzerland) among others. Interestingly, the service lets you store your location without sharing at all, so that you can create a personal location ‘diary’ of places you’ve been. UPDATE: Interestingly,Foursquare is not supported in Ovi Maps, although Foursquare is showing off its own spearate app, coming soon to the Ovi Store. Nokia tells me there is a problem syncing up the two companies’ location databases. They would, however, like to support it in the future.

In the video below, a Nokia rep takes us through a Facebook Places check-in via Ovi Maps.

See our liveblog of this morning’s Nokia World keynote here, news of new devices the C6 and C7 here and the new Communicator device the E7 here.