I've not checked the legitimacy of the photo, but the premise is important to note
It's estimated stoning isn't used that much ( if at all anymore), but there's an interesting inequality about it too
Individuals sentenced to stoning are placed in a stoning pit, buried to the neck (women) or waist (men), and others hurl stones at them until they escape the stoning pit, are incapacitated, or are killed. Because men (unlike women) are only buried to the waist, men occasionally do escape the stoning pit, which terminates the penalty.
Mohammad-Javad Larijani, chief of Iran's Human Rights Council (in 2010), rejected international condemnations of stoning, saying that, "in the eyes of some people, stoning is a lesser punishment than execution because there is a chance you should survive."[66] However, there are at least two newspaper reports of women managing to pull themselves out of their hole while being stoned, but being killed nonetheless after being forced back into the hole.
Overall death penalty seems to be really popular in Iran, estimated to be the biggest death penalty country per capita. And no wonder when you look at the offenses that merit death penalty
Death sentences in Iran are, in theory, legal for a variety of crimes, such as armed robbery, treason, espionage, murder, certain military offenses, drug trafficking, rape, homosexuality, sodomy, sexual misconduct, incestuous relations, fornication, prostitution, plotting to overthrow the Islamic regime, political dissidence, sabotage, apostasy, blasphemy, adultery, producing and publishing pornography, burglary, recidivist consumption of alcohol, recidivist theft, rebellion, some economic crimes, kidnapping, terrorism and few others.