The site really overstates the case when it implies that Fourquare knows when you leave home. It doesn't. It also doesn't know where you live.
Now, if you have a large circle of friends and some of them are extremely unreliable, then you might not want to tell the truth to Foursquare!
I follow about 400 people now, up from almost nothing a month ago, and I can't keep up. I will try Cadmus based on your recommendation, Mike, and report back.
The site really overstates the case when it implies that Fourquare knows when you leave home. It doesn't. It also doesn't know where you live. Now, if you have a large circle of friends and some of them are extremely unreliable, then you might not want to tell the truth to Foursquare!