"I was posting rubbish on Facebook when I got this weird pop up. It was the monster of myth, Cerberus, the three-headed hound that guards the gates of the Underworld. I clicked on impulse and I found myself on the start up menu of a game. It had me hooked right away. I got to the end of the first level and it asked me to fill out an online form. My parents have always said I shouldn t give any details out to people on the Net. They're always going...