said it was cooperating with state attorney generals in the US to reveal all known details of sex offenders from the portal, believed to be in the thousands.
In a series of statements released yesterday, MySpace said it was "doing everything short of breaking the law" to ensure information on "sexual predators" is handed over to the authorities.
News Corp said it is able to release personal details on MySpace users under the US Electronic Communications Act, but said it can only do so when issued with a subpoena.
In the autumn MySpace hired online security company Sentinel Tech to create a database able to match MySpace profiles with public sex offender records. The software went live 12 days ago.
However, legal authorities in the US have criticised MySpace for not doing enough. Richard Blumenthal, attorney general for Connecticut, said: "Much of the information we have sought, specifically the numbers of convicted sex offenders on the site, requires no subpoena or any other compulsory process."
The news follows growing concerns expressed by parents over safety issues for young adults using MySpace. The community portal has been implicated in a number of abductions and sex crimes in the US, despite adopting a zero tolerance policy toward users posting sexually explicit material.
In January, four families in the US said they would sue MySpace for millions of dollars for failing to prevent adult users from contacting their teenage daughters, who met their sexual assailants via the portal.
Hemanshu Nigam, chief security officer at MySpace, said: "We've made it clear we have a zero tolerance policy against convicted sex offenders. We've said numerous times that the goal was to delete them."
However, Nigam added that federal and state privacy laws in the US prevented MySpace from handing over details of offenders to the legal authorities.