A fourteen-year-old boy has had his identity stolen, and it is now being used to bully and sexually harass other Facebook users.

Now he's the one living in fear.

When it comes to the world’s biggest social networking site, it seems no one is truly secure, and no account is completely safe.

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Even after closing his account with the help of his mum Kate, Oliver Hay became the victim of hackers who opened a new account in his name, and used it for a series of cruel jokes.

Within days a series of sexually explicit messages were sent out using his details, to both students and teachers at his school.

Because his email was attached to the fake account, fourteen-year-old Oliver saw the messages and angry responses from girls his age.

“I've seen people in town and they've said ‘next time I see you I am going to kill you’. I've been pretty depressed about it. I have been thinking of committing suicide,” Oliver said.

He has been forced to change schools but the cruel Facebook prank has followed him.

“Some girls thought that Oliver was having a relationship with them, so they entered in conversations, and sent photographs on request,” Kate said.

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He is one of half a million Australians to have had their identities stolen.

Leigh McKay has been a victim of Facebook hackers twice. “The first one was from Russia, and the second one was from Israel or Jordan,” McKay said.

His identity was stolen. “My name was changed to Momo Koko and it looks like it was in Arabic.”

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The 36-year-old believes he was targeted because he had made money playing on a poker application.

There are more than 750 million Facebook accounts worldwide. Each week another million users sign up, and many have no concerns when adding friends they don't know.

Tech expert Duncan Riley from Inqisitor.com says “the bigger something becomes, the more appealing it becomes as a target for people who want to do the wrong thing.”

“We put so much personal identification on Facebook - everything from our dates of birth, to the names of our relatives and friends. It’s information that can be used by criminals to do things like create false identities and open bank accounts,” Riley said.

According to Graeme Samuel, Chairman of the ACCC “the scammers often will not be in Australia, they'll be overseas.”

“People ask me what is one of the first sites I would put into my favourites list, and I say Scamwatch. It tells you what the traps are, it tells you how to avoid the traps, and therefore how to avoid the losses that will flow from falling into those traps,” he explained.

Even the king of Facebook isn't safe, and founder Mark Zuckerberg's fan page was attacked by hackers. A message purporting to be from the millionaire was sent, suggesting Facebook become a charity-focused business.

“What hackers are doing is looking for insecurities in people's settings,” AFP High Tech Crime national manager Neil Gaughan said.

• Do not open emails unless you know who they come from.
• Do not send personal information, including passwords, over the internet to others.
• A password of only six lower case letters can take under four minutes to crack.

• SCAMwatch - www.scamwatch.gov.au