This chapter introduces the new paradigm of Social Language Intelligence (SLI), a strategic and integrative approach that leverages Natural Language Processing (NLP) technologies to enhance social media marketing. As companies increasingly seek to extract actionable insights from vast volumes of social media data, traditional approaches to NLP integrations in social media remain fragmented and limited. This entry synthesizes findings from the current literature to discuss four critical barriers to successful NLP implementations in social media marketing: (1) concerns about the credibility of NLP-generated outcomes from social media data, (2) insufficient marketing-specific customization of NLP algorithms for social media, (3) challenges in handling the cross-modality of social media data in NLP technologies, and (4) limited convergence between evolving NLP capabilities and existing social media marketing processes. To address these barriers, SLI offers a new paradigm that systemically integrates NLP technologies, which is outlined in this chapter. Further, this chapter provides marketing scholars and practitioners with a comprehensive perspective of the future of social media marketing enabled by language intelligence.