context: Although there were some older writings about social psychology, such as those by Islamic philosopher Al-Farabi (Alpharabius),[4] the discipline of social psychology, as its modern-day definition, began in the United States at the beginning of the 20th century. By that time, though, the discipline had already developed a significant foundation. Following the 18th century, those in the emerging field of social psychology were concerned with developing concrete explanations for different aspects of human nature. They attempted to discover concrete cause and effect relationships that explained the social interactions in the world around them. In order to do so, they believed that the scientific method, an empirically based scientific measure, could be applied to human behavior.[5]
question: When was social psychology first practiced?
answers.text: 20th century beginning of the 20th century