"My Facebook page was pirated by someone who changed the password, but the problem has since been sorted," Mohammad Javad Zarif was quoted as saying by state news agency IRNA.
"If this happens again, I may have to stop having a Facebook page," he added.
The US-educated diplomat regularly updates his Facebook page (facebook.Com/jzarif) where he posts in Farsi, and sometimes interacts with some of his more-than 184,000 fans.
Zarif also has a Twitter account in which he posts in English -- despite no one inside the country being allowed legally to read his tweets.
Tehran blocks access to Twitter, Facebook, YouTube and numerous other sites, including blogs and pornographic hubs, as it tries to stop Iranians from surfing content authorities seen as undermining the Islamic regime, or as being immoral.
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