Mr Farage said the BBC would be "within its rights", under the terms of its editorial guidelines, to stage a debate without Mr Cameron and providing an empty podium would be "entirely appropriate".
Polls are being taken online while speakers are on the podium, providing a real-time reaction to their speeches.
"Wi-Fi in the parks provides an excellent podium for us to showcase these new kinds of applications," he said.
"Therefore, if you are unwilling to reconsider, the three party leaders who have committed to participate will ask the broadcasters to press ahead with the debates and provide an empty podium should you have a last-minute change of heart.
The added: "Therefore, if you are unwilling to reconsider, the three party leaders who have committed to participate will ask the broadcasters to press ahead with the debates and provide an empty podium should you have a last-minute change of heart".
Many authors love to talk about the ideas of their own book - especially in case you provide an interesting podium for them to share their ideas in front of a very huge or very select audience.
A Russian and a Georgian shared a podium today, putting aside the conflict that has erupted between the two countries and providing a lift to a Georgian team that had contemplated withdrawing from the Games.
It was set up by Podium, the London 2012 HE and FE Unit, which itself is a unique and pioneering agency in Olympic history, providing a crucial catalyst for collaborations across the sector and necessary liaison across various stakeholders.
The drawbridge that loomed behind the podium provided a striking backdrop to the news conference, evoking a tradition of purposeful investment in infrastructure to meet the needs of the City and its people.
At the first discussion, on Oct. 18, Prof. Ralph Stein leaned into the podium and said that the Constitution would not provide a security blanket to terrorists.
