What is the ruling on someone who said to his wife: "If you open Facebook, then you are divorced," and does he have to offer expiation, and is this considered a divorce?

The majority of scholars hold that a wife is divorced when the condition is met, if the husband made her divorce contingent upon a condition, whether he intended to effect the divorce or merely intended a threat, emphasis, or prohibition. This is the fatwa we adhere to. However, Sheikh Al-Islam Ibn Taymiyyah is of the opinion that the divorce does not occur if the husband did not intend to effect the divorce but rather intended a threat, emphasis, or prohibition, and in such a case, he must pay an expiation for a broken oath (kaffarat yameen).

Based on this, the fatwa we adhere to is that if you do what your husband made your divorce contingent upon, the divorce occurs. If this divorce does not complete the three divorces, then your husband has the right to take you back before your waiting period (iddah) expires.

As for the view of Sheikh Al-Islam Ibn Taymiyyah, if the husband intended to effect the divorce, then the divorce occurs, and he has the right to retract it. If he intended a threat or prohibition and not the effecting of divorce, then if you do what was made contingent, your husband must pay an expiation for a broken oath.