The iconic Situation Room photograph, captured by offical White House photographer Pete Souza, has now been viewed more the 2.5 million times on the web.
The corresponding photo page on Flickr says little about the photograph but if you download the full-size version, you can get details about the camera model, the camera settings and even the software that were used to edit this picture before it was published online.
This information is stored in every digital image, in the form of EXIF tags, and you can extract it using Windows Explorer or with the help of even the most basic image editing software. In the case of mobile phones, your pictures may even include location information thus giving others an idea of the exact geographic coordinates where that shot was taken.
If you are planning to share your personal photographs over email or on a public website (like Tumblr), it may sometimes make sense to remove the camera data and the location information from the images before putting them online.