Location based social networks are social networks that use GPS features to locate you and that let you broadcast your location and other content from your mobile device. Yeah, location-based social networks are a little creepy. I mean you're basically checking in when you arrive someplace to let your network contacts or the public at large know where you are and what you're doing. So if you're creeped out about revealing your location, maybe you shouldn't do it. But don't let that turn you away. You may be surprised by what these networks can do for you.