WhatsApp , that application that has become indispensable in our lives as a means of communication, allows the option to block contacts so they can not send messages to us, or access our states. Nor can they know our last connection time or our description, much less our profile picture. This function is very practical when cutting relationships with those people who are "embittering" the digital existence. But what happens when we are the blocked ones? Can we know if this "corrective" has been applied to us?