People speak in different ways within and across contexts; and utterances that are equivalent in their essential content and force can differ in their social significance in virtue of differing phonologically, morphologically, syntactically, and lexically. These dimensions of linguistic variation have not received sustained philosophical attention. We argue that meaningful form contributes significantly to the speech acts that agents perform with their utterances. Speakers communicate social information by navigating fine-grained differences in how they speak, and hearers systematically pick up on and use this information. Moreover, these fine-grained differences performatively alter the conversational context. We review three options for handling these aspects of speech within the philosophy of language—exclusionism, informationalism, and performativism—and sketch prospects and challenges for a theory of sociolinguistic variation going forward.