The self-styled co-founder of Facebook, who disappeared while on house arrest in March 2015, has said he and his family alive and well, but still fleeing a CIA plot to kill him.

Paul Ceglia, 43, claimed in 2010 that he owned 84 per cent of Facebook per an alleged 2003 contract with Mark Zuckerberg. In 2012 he was charged with altering documents to bolster his claim.

Now he and his family - wife Iasia, two teen sons and dog Buddy - are on the run after they fled last year. And according to Bloomberg, Ceglia still fears for his life.

Fugitive: Paul Ceglia (pictured in 2012) claimed he paid for half of Facebook's development in 2003 and lent Mark Zuckerberg code. He sued Zuckerberg and Facebook in 2010

In emails sent to the site from August 3-8, Ceglia said he and his family had fled abroad and were now living under the radar, lest the CIA kill them.

Police entered his home in Wellsville, New York, on March 5 to find his ankle bracelet connected to a contraption that was designed to make it look like he was walking around his home.

Ceglia claims that he had a 'very credible' threat that he would be arrested on new charges, jailed and killed - and had to flee before that happened.

'I felt I had no one in government I could trust,' Ceglia wrote in one of four e-mails.

'An opportunity presented itself, so I MacGyver’d some things together and started running for my life.'

Denial: Zuckerberg denied claims. In 2012, Ceglia was accused of doctoring evidence and placed on house arrest. He and his family vanished in 2015, leaving ankle bracelet behind

He says the reason for the supposed plot against his life is that his fraud trial might reveal involvement by the CIA's venture capital arm, In-Q-Tel, in Facebook.

Exactly what that alleged involvement was is not clear.

It's not known where Ceglia is, or even if he is truly abroad and applying for asylum, as he says he is.

He will only say that he is 'living on the air in Cincinnati,' a line from the theme tune of TV show 'WKRP in Cincinnati.'

On the run: Ceglia, his wife Iasia (left), his two sons and dog Buddy are all now abroad, he says, and seeking asylum. He says the CIA wants to kill him because of what he knows

But Robert Ross Fogg, one of Ceglia’s lawyers in the criminal case, said he is 'relieved' to discover that Ceglia is safe and well, and disappeared under his own volition.

He also asked Ceglia to return, pointing out that a judge in December said there was 'probable cause' for Ceglia's contract claim. 'To win this case, I need him home,' Fogg said.

Ceglia hired Zuckerberg to write code for his now-defunct website Streetfax.com in 2003.

He says he gave Zuckerberg money and access to the Streetfax search engine in an early build of what was then called 'The Face Book'.

Zuckerberg says that his contract was only for Streetfax.com and that he didn't think of Facebook until much later.