(CNN) -- How many young people have gotten in trouble for something they've posted on Facebook? Maybe a party picture or an offensive comment compromised their chances at a job. But a 25-year-old Iranian says his Facebook activity has led to his father's detention in a notorious prison in Tehran. And now he's struggling to find a way to free him. "I want my family to forgive me," Yashar Khameneh said. "But I believe what I believe in." A year ago, while studying at a college in Holland, Khameneh joined a Facebook page that made fun of a top Shiite Muslim imam, Ali al-Naqi al-Hadi. Naqi is one of 12 imams considered successors to the Prophet Mohammed. Called "Infallibles," the imams are protected by law in Iran from ridicule or even frivolous comments. One can be arrested for insulting them.
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25-year-old Iranian contributed to Facebook page insulting imam
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Yashar Khameneh says his father was arrested for his Facebook activities
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He says government has demanded passwords in exchange for freedom
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But Khameneh says he doesn't manage the page and cannot take it down
Allowing @placeholder to succeed in taking the page down would be to defeat the very reason it was created: to challenge authority and create a greater sense of free expression.
"It would be too dangerous for @placeholder's family in Iran for him to make up something like this," Ghaemi said.