Most people have no idea that when they take a picture with their mobile phone, it can be automatically tagged with the location that the picture was taken. Simple software can then be used to discover this information on ANY picture posted on the web or social networks like Facebook or twitter. This poses an incredible privacy risk to people who take pictures of their family and then post them online. Watch this video from NBC News on how it works and how to stop it.
Security Tip: Make sure you disable location features on your phones camera before you post online!