But while many of these kinds of apps allow users to pick and choose what information about them is shared, others don't. Take, for example, the app Girls Around Me, which recently received a lot of flack for being...well, creepy. This controversial app surreptitiously pulled public information and images from the web through services like Foursquare and Facebook in order to show users which girls (or boys) were physically near them. (The app is no longer available in Apple's App Store.)
While Girls Around Me was certainly sketchy, it did little more than lay out information that users had already made public via social networking services. It seems the moral of the story here is: Be careful what you share. And be aware of what apps exist that make it easy for any stranger to take a peek at what you'd rather keep under wraps.
Flip through the slideshow (below) to check out some of the creepiest apps that might make you think twice about how safe you are from creepers. Then, take a look at our slideshow featuring 9 of the most controversial apps censored by Apple's app store.
Did we leave out any creepy apps? Want to suggest another one we should include? Tell us about it in the comments and include a link. You can also tweet your suggestions to us @HuffPostTech, or email us: firstname.lastname@example.org. We can't wait to see what you've found!