I agree with Kathy that there is some concern with using 4Square (or any social media) to tell everyone your location. Just because you haven't marked your "home" location in 4Square doesn't mean it isn't fairly easy to find. Particularly if you use your real name anywhere and have your social media linked. Once someone has your actual name & your home town (or if the name is fairly unique - your home state may be sufficient) odds are they can find your home address. If your home is in Illinois and you are posting all over social media that you are at Disneyworld, there is a very good chance that no one is at your home and a thief can target it. Even if you haven't included your home state/town in one of your profiles, there are other ways to figure it out. Maybe you check-in at locations near your home frequently or maybe you mention something local in a post (name your local politician, reference a local news story, something about a local sports team, etc.) It is certainly a personal decision how concerned you are about privacy and how concerned you are about others knowing you aren't home - just be aware that the odds are fairly high someone can figure out your home address without too much trouble if you aren't being very cautious about the information you are putting out there.