#BBCtrending: Why are men wearing the hijab in Iran?
22 May 2014 Last updated at 13:00 BST
In Iran, it's against the law for women to leave their hair uncovered in many places.
Last week, we reported on a Facebook page where Iranian women are defying those restrictions and posting images of their uncovered hair online.
The same day as our report, a backlash began - with a rival Facebook page attacking those women, and other sites making fun of the hijab issue.
Video journalist: Benjamin Zand