FlickSquare is an app that utilizes the APIs of Foursquare and Flickr so that your Foursquare checkin photos will be added to your Flickr account automatically. This means that you do not need to upload that photo again in Flickr. Thanks to Benny Wong for developing this handy app.
Machine tags will also be added to the photos that were automatically added in Flickr via FlickSquare. Foursquare machine tags in Flickr may be added manually by tagging the photo with “foursquare:venue=XXXXXX” where XXXXXX is the venue ID. A link to the Foursquare venue will be automatically added.
So far, what I can do with FlickSquare is to either turn on or turn off syncing of Foursquare checkin photos to Flickr. I think it would be great if the photos shall be published to your contacts only, to yourself only or everybody.
I really hope that Foursquare would add the Flickr option in the near future so that I can control whether to upload the picture to Flickr or not.