Washington - DNA testing of the wannabe billionaire's soft tissue has thrown up the ultimate rogue parent scenario.
According to a secret FBI memo published today some distinctive flaws in the maternal genome identify Ecuador corruption-peddling twaddle lawyer Karen Hinton as mother of the brat.
The [so far] unnamed father is thought to be a bent Canadian lawyer who cooked up the entire Amazonbotch get-rich-quick scam aiming to fleece $18 billion from super major Chevron.
Their spawn appears to have been dropped cuckoo-like into the Zuckerberg family nest in a fraudulent peace pact some 30 years ago.
Co-incidentally an internal FBI report is also warning that the Farcebook founder's social nitworking site ownership claims 'may be as spurious as the Ecuador litigation targeting Chevron'.
Plans to float the website on the open market have seen it valued at $18 billion - an identical figure to the Ecuador scam.
Last weekend British phone hacking scandal inquiry detectives flew out to the US for a secret summit with their FBI counterparts.
Cooperation between the two law enforcement agencies sees a planned swoop on some 100 ex-KGB spooks resident in the US who have greased the wheels in Ecuador's criminal Amazonbotch litigation.
Expect a successful dawn raid before the week is out.