Posting a photo with keys in front of a new home or car is a major social media trend, but is also a bad practice. These photos often go on sites like Instagram and Facebook with a location tagged or even without. It is still not clear whether social media sites remove data that can reveal where photos were taken. Additionally, most photos these days are taken on smartphones, with very high-definition cameras able to pick up every notch on a key. Once criminals have a photo of your key, there are several ways they can make a physical copy.