take some time to learn about what EXIF data is and how to DELETE it from any pictures you take (and especially any you share or post) ..your camera can fuck you.
http://en.wikipedia.org/wiki/Exchangeable_image_file_format
The metadata tags defined in the Exif standard cover a broad spectrum:
Date and time information. Digital cameras will record the current date and time and save this in the metadata.
Camera settings. This includes static information such as the camera model and make, and information that varies with each image such as orientation (rotation), aperture, shutter speed, focal length, metering mode, and ISO speed information.
A thumbnail for previewing the picture on the camera's LCD screen, in file managers, or in photo manipulation software.
Descriptions and copyright information
they can also match your picture to your camera
http://www.utahether.com/2011/01/24/good-advice/