These days, any photo you shoot with your iPhone or other smartphone will typically contain location data (unless you have that feature turned off) to allow apps like iPhoto to place your images on a map.
Even photo-sharing services use this data, with some — like Flickr — posting it prominently on your photo pages (along with all the other EXIF data, like shutter speed and f-stop).
If you don’t want the location of your photos to be known, the Yosemite version of OS X’s Preview can take care of it for you. Let’s strip that location data before we post that photo to the Web, OK?

