He said that his flight from the United States had been delayed and that he might not be able to catch his next flight to Tehran.
He added that he just wanted to greet his fans from above:
"It's 8:30 a.m. New York time and 4 p.m. according to the time of our dear Iran. I don't know where I am exactly, and what the local time is. I was supposed to give you an [update] from Tehran. But I just realized that the plane has the possibility to access the Internet...."
This is how one Facebook user reacted:
"Dr. [Zarif] try to go to Facebook.com on your phone. If it's blocked you've reached Tehran."
The last time we checked the comment had received some 7,000 "likes."
For more on Zarif's Facebook page and the debate it has generated in Iran click here and here.