Mohammad Reza Aref, a former vice president seen by some as the leading reformist candidate, had part of his appearance cut off.
Mohsen Rezaei, a former Revolutionary Guards commander, complained parts of his first campaign-related interview had been censored.
Rezaei's campaign later used its own website to show what it claimed to be the cut-out video.
Other candidates are also finding ways to venture online, including the likely frontrunner, chief nuclear negotiator Saeed Jalili, who has his own Twitter feed.
Still, the international concern is so great that the United States is relaxing sanctions on Iran to allow American companies to sell mobile phones - such as Apple's iPhone - software and other technology in hopes of helping Iranians skirt the censors.
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2013-11-25
2013-11-25
2013-11-25
2013-11-25
2013-11-25
2013-11-25