Some people may be confused with what the word 'hacking' means. In computer terminology if you were to hack your friend's Facebook to post silly things in his name, you would need to either manage to access Facebook's data storage and perform SQL queries to find the person's log in info, or have gotten it from some sketchy website that stole your target's password when you logged in. If you just saw that your friend happened to have left his or her Facebook logged in, well, you didn't hack it exactly- but it's still a very much appreciated the prank. Check out this list of hilarious Facebook hacks left on the walls of unsuspecting mothers, siblings, friends, and enemies. Maybe you'll find some inspiration next time you get access to a friend's account.