Did you know Facebook has a feature called 'Facial Recognition' that allows people to tag photos that may contain your face, without your permission? It has been around for a while and this feature is turned on automatically. If you like to be tagged in photos, enjoy. If not, to turn it off:
1 Go to the "Account" tab in the top right hand corner
2 Click on "Privacy settings"
3 Click "Customize settings"
4 Scroll down to "Things others share"
5 Click "Edit settings" next to "Suggest photos of me to friends"
6 Choose "Disable" or "Enable" from the drop down