Iran’s leader Ayatollah Ali Khamenei issued a fatwa banning unrelated men and women from chatting online.Khamenei’s decision came in response to a question sent to him on his website, Al Arabiya reported, quoting Iranian media.“Given the immorality that often applies to this, it is not permitted,” Khamenei wrote.While many Iranian leaders have a large presence on social media websites, many are blocked in Iran, including Facebook and Twitter.