All foreign messaging and social media apps operating in Iran have one year to move ‘data and activity’ associated with Iranian citizens onto servers in Iran. Last year, Iran blocked Telegram and many other social networks after their founders refused to help Iranian authorities to spy on their citizens. Some of the most popular messaging services like WhatsApp Apple iMessage, and Telegram are offering end-to-end encrypted communication i.e. not even WhatsApp can read the content of your messages. Just two weeks back Iranian authorities arrested eight women with involvement in online “un-Islamic” modeling photographs without wearing the compulsory headscarf.
Source: https://thehackernews.com/2016/05/iran-messaging-apps.html