Most information posted online: (1) can be searched, (2) can be seen by HUGE, invisible audiences, (3) can be copied, altered, and sent to others, and (4) is persistent – it’s almost impossible to take down, as it can start to spread the minute it is posted.
Common Sense on Privacy and Digital Footprints:
http://www.commonsensemedia.org/sites/default/files/uploads/classroom_curri...