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Obama's innovative use of the Web during his campaign, for everything from encouraging supporters to vote to raising funds, marks a turning point in how politicians use the Internet and in how citizens can participate for social change, Gore said.

"What happened in the election opens up a whole new range of possibilities," he said. "Now's the time to really move swiftly to exploit these new possibilities."

Gore also talked about how his company Current TV, of which he is chairman and cofounder, is attempting to use the Internet to break television's decades-old monopolization of information, which he said has had negative consequences.

"A reason why the political system hasn't been operating very well until this election is the deadening influence of the TV medium as it has been operating," he said.

Asked by conference chair John Battelle if he is worried that this Web-powered social involvement among citizens will lose steam, Gore said: "No, I'm not. It's very much in its infancy, barely beginning. We aren't many years away from TV sinking into the digital world and becoming a part of it."

"The social activism that's made possible by these new tools is just beginning to take off," he added.

Gore, who has become a leading voice in recent years for the protection of the environment, said President-elect Obama should be bold in his goals to address climate change. For example, he should set a national goal for the U.S. to get all its electricity from renewable and non-carbon sources within 10 years.

"We can do it," he said, amidst heavy applause from the audience.

He cited various imminent dangers for the environment, including the 75 percent to 80 percent chance that in the next 5 years, the North Pole ice cap, which has been around for about 3 million years and is almost the size of the continental U.S., will disappear.

"This is an apocalyptic signal from the planet itself," Gore said.

One of the many ways that the election of Barack Obama as president has echoed that of John F. Kennedy is his use of a new medium that will forever change politics. For Mr. Kennedy, it was television. For Mr. Obama, it is the Internet.

“Were it not for the Internet, Barack Obama would not be president. Were it not for the Internet, Barack Obama would not have been the nominee,” said Arianna Huffington, editor-in-chief of The Huffington Post.

She spoke Friday about how politics and Web 2.0 intersect on a panel with Joe Trippi, a political consultant, and Gavin Newsom, the mayor of San Francisco, at the Web 2.0 Summit in San Francisco.

Howard Dean’s 2004 campaign -– which was run by Mr. Trippi –- was groundbreaking in its use of the Internet to raise small amounts of money from hundreds of thousands of people. But by using interactive Web 2.0 tools, Mr. Obama’s campaign changed the way politicians organize supporters, advertise to voters, defend against attacks and communicate with constituents.

Mr. Obama used the Internet to organize his supporters in a way that would have in the past required an army of volunteers and paid organizers on the ground, Mr. Trippi said.

“The tools changed between 2004 and 2008. Barack Obama won every single caucus state that matters, and he did it because of those tools, because he was able to move thousands of people to organize.”