This paper not only claims that the so-called ‘geolinguistics’ should be divided into two sub-branches, geolinguisticsand linguistic geography, but also advocates that the factors of sociolinguistics should be involved in geolinguistics,so as to set up ‘social geolinguistics.’ The study introduces this very newly-emerging research trendin Taiwan, and discusses its methodology. After reviewing the six studies of ‘social geolinguistics,’ wepropose eight points of criticismon methodology. Then it focuses on the methods of‘sociolinguistic geography’, and introduces how theLanguage Atlas of Taiwan(LAT)integrates elements of linguistic sociologyinto both the languagecategorizationand regionalization. The study ends with reflectionsand explanations for two possible criticismswhich question the validity of this new approach.