I think it's far more interesting and productive to use facebook posts for this, rather than GPS coordinates in EXIF data and comparing it with a phone book (which is essentially what they're doing, according to the about page). Facebook posts often contain much more information and that information is easier to extract.

Realistically speaking, neither of these cases will be addressed. Although properly using the privacy settings can help, the entire reason people use tools like these is to express themselves about things they're seeing, and that usually doesn't happen at home. This coupled with the fact that the risk is extremely low, and that there are much better ways for a burglar to obtain this information, I don't think this is the best way to go about privacy awareness. It was probably fun to build, though.