“Check the source” may be the first rule of journalism. But in the coverage of the protests in Iran this month, some news organizations have adopted a different stance: publish first, ask questions later. If you still don’t know the answer, ask your readers.

CNN showed scores of videos submitted by Iranians, most of them presumably from protesters who took to the streets to oppose Mahmoud Ahmadinejad’s re-election on June 12. The Web sites of The New York Times, The Huffington Post, The Guardian newspaper in London and others published minute-by-minute blogs with a mix of unverified videos, anonymous Twitter messages and traditional accounts from Tehran.

The blogs tend to run on a separate track with more traditional reporting from the news organizations, intersecting when user videos and information can be confirmed. The combination amounts to the biggest embrace yet of a collaborative new style of news gathering — one that combines the contributions of ordinary citizens with the reports and analysis of journalists.

Many mainstream media sources, which have in the past been critical of the undifferentiated sources of information on the Web, had little choice but to throw open their doors in this case. As the protests against Mr. Ahmadinejad grew, the government sharply curtailed the foreign press. As visas expired, many journalists packed up, and the ones who stayed were barred from reporting on the streets.

In a news vacuum, amateur videos and eyewitness accounts became the de facto source for information. In fact, the symbol of the protests, the image of a young woman named Neda bleeding to death on a Tehran street, was filmed by two people holding camera phones.

“It’s incredible, the volume of stuff coming out” from Iran, said Matthew Weaver, who sounded exhausted Thursday evening after blogging for more than 10 days for The Guardian newspaper’s Web site.

When rallies and conflicts occur “first the tweets come, then the pictures, then the YouTube videos, then the wires,” he said. “It’s extraordinary.”

Most important, he said, what people are saying “at one point in the day is then confirmed by more conventional sources four or five hours later.”

CNN encourages viewers to upload pictures and observations to iReport.com, its Web site for citizen journalism. Every upload is posted automatically on iReport.com, but each is studied before being shown on television.

In the vetting process, CNN contacts the person who posted the material, asks questions about the content and tries to confirm its veracity. Lila King, the executive in charge of iReport, said the staff members try to “triangulate the details” of an event by corroborating stories with multiple iReport contributors in a given area. Farsi speakers at CNN sometimes listened intently to the sound from the protest videos, discerning the accents of Iranian cities and transcribing the chants and screams.

Because the videos and images are not taken by a CNN employee, the network cannot completely vouch for their authenticity. But without professionals at the scene — CNN’s remaining correspondent was pulled out last week after the government imposed prohibitive restrictions — they provide the all-important pictures to tell the story.

In an indication of how difficult the process can be, CNN had received 5,200 Iran-related submissions and had approved about 180 of them for use on television.

Iran is now the third biggest traffic driver to iReport.com, behind the United States and Canada. One month ago, Iran ranked No. 63 on the list of countries. Ms. King called Iran a “watershed moment” for citizen dispatches, and for the first time an iReport producer sits at the main CNN newsgathering desk.

Bill Mitchell, a senior leader at the Poynter Institute, a nonprofit school for journalists, said the extent of user involvement shown in the Iran coverage seems to be a new way of thinking about journalism.

“Instead of limiting ourselves to full-blown articles to be written by a journalist (professional or otherwise), the idea is to look closely at stories as they unfold and ask: is there a piece of this story I’m in a particularly good position to enhance or advance?” he said in an e-mail message.

“And it’s not just a question for journalists,” he added.

Nico Pitney, the senior news editor at The Huffington Post, started to aggregate Iran news on June 13, the day after the election. By the middle of last week, the blog — with several updates an hour during the day — had received more than 100,000 comments and five million page views.

– By BRIAN STELTER

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