I was going to say something about how companies will sell lockpick sets to anyone and that's perfectly legal even though it facilitates burglary, but I thought

I was going to say something about how companies will sell lockpick sets to anyone and that's perfectly legal even though it facilitates burglary, but I thought of another example that might be more revealing. Say I'm an asshole and make an app that scrapes Facebook statuses. I call it "Who's Not Home?" If someone posts something like "On vacation in Barbados" in their status, it puts their name and address (plenty of people put their addresses on Facebook, or at least their general area) on a map. Why? I feel like it. I'm not making any money off of it, and the software is completely open source. Of course, the only real purpose of this is for burglars to get easy targets. Would this be legal?