The story

A group of 20 to 30 men, carrying clubs and metal pipes, banged on the door of an apartment building in a Tehran neighborhood.

The group was agitated. They chanted and shouted and kept banging on the building's door. Inside, they suspected, was a person who had chanted a slogan against President Mahmoud Ahmadinejad.

This scene was witnessed by CNN reporters in Tehran on Sunday. But in the confusion and controversy that has followed Ahmadinejad's re-election, many stories like this have been told through social networking Web sites such as Twitter -- despite reports that the Iranian government has clamped down on such services and mobile phones. Read full article »

CNN's Christiane Amanpour and Samson Desta contributed to this report.

All About Mahmoud AhmadinejadIranMir Hossein MoussaviAyatollah Ali Khamenei

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