Facebook hacker: Tech 24 speaks to Khalil Shreateh
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A message left on Marc Zuckerberg's wall has changed the life of Palestinian programmer Khalil Shreateh. We talk to the hacker who slipped behind the wall of the Facebook founder. And in TEST 24, we take a closer look at a new technology that may be coming your way sooner than you think: Li-Fi, or Light Fidelity.