Another Facebook group,
Female Equals Male, boasts more than 140,000 "likes." Following the earthquakes, the group encouraged followers to head to blood-donation stations in cities across Iran.
The call was answered, with eyewitnesses reporting that people were standing in line well after midnight on the night of the tragedy to help fill depleted blood banks.
"I work for one of the blood-transfusion centers in Tehran," wrote Ahmad in a message posted on August 13. "And I can say it was the first time that I have ever seen people being so eager to donate blood. It has always been us, pushing, advertising and asking people to do so."