Originally Posted by
Science Drone
You might be on to something there. Foursquare's mobile apps report the user's GPS coordinates as part of the checkin. Web-based checkins (like the mobile website and Auto4sq) don't have that info. Topguest may have decided they need coordinates to "prove" a checkin is legit.
Foursquare used to report back coordinates for the locations you checked into. You could harvest all the locations and then supply them at later check-ins. I did that and I haven't gotten points for several weeks now.