Prime Minister Kevin Rudd and Opposition Leader Tony Abbott look set to face off on Sunday in the first debate of the federal election campaign - and the first to involve Facebook.

ALP national secretary George Wright has written to his Liberal Party counterpart Brian Loughnane accepting the offer of a leaders debate on Sunday.

"I'm completely relaxed about debating Mr Abbott," Mr Rudd told reporters in Sydney on Wednesday.

"Sunday's available."

Mr Wright proposes the Seven Network, in conjunction with Facebook, host the first debate in Sydney.

It would be the first time social networking site has been directly involved with a televised federal election debate.

"The involvement of Facebook will facilitate greater participation from young people," Mr Wright said.

Mr Loughnane had suggested the first televised debate be held at National Press Club in Canberra, with the leaders making opening remarks and taking questions from a panel of journalists.

Mr Wright also said all the major television networks had contacted Labor asking to host debates.

"We have taken up their offer, should Mr Abbott be willing to participate and a suitable time can be found," he added.

This raises the prospect of as many as six debates - hosted by each of the free-to-air networks and another on pay TV broadcaster Sky News.

Mr Loughnane had proposed a further two televised debates beyond Sunday - at Rooty Hill RSL in Sydney's west and in Brisbane - be held in the lead-up to the September 7 election.

Sunday night's format was jointly proposed by Seven and Facebook.