"Studies of [the first] type are based on empirical work on language as it is spoken in its social context, and are intended to answer questions and deal with topics of central interest to linguistics... the term ‘sociolinguistics’ [here]... is being used principally to refer to a methodology: sociolinguistics as a way of doing linguistics.
"The 2nd category... includes [areas] such as: sociology of language; the social psychology of language; anthropological linguistics; the ethnography of speaking; & [interactional] discourse analysis.