BBC NEWS/Ruhollah Zam was hanged on Saturday after the supreme court upheld a death sentence against him, state television reported.
Zam, who had been living in exile in France, was reportedly detained after travelling to Iraq last year.
He ran Amad News, a popular anti-government website Iran accused of inciting the 2017-18 protests.
The network, which had more than a million followers on the encrypted messaging app Telegram, shared videos of protests and damaging information about Iranian officials.
