The rapid proliferation of social media platforms over the past two decades has precipitated a fundamental restructuring of human communicative behaviour, with measurable consequences for lexical innovation, syntactic convention, orthographic norms, and the distribution of linguistic authority. This article investigates the transformative impact of hyperconnected digital ecosystems — principally Facebook, X (formerly Twitter), Instagram, and TikTok — on the trajectory of language evolution in the twenty-first century. Drawing on theoretical frameworks from sociolinguistics, cognitive linguistics, and digital communication studies, the study analyses four interconnected dimensions of linguistic change: the acceleration of neologism formation and the entrenchment of digital vernacular; the structural and pragmatic shifts in written syntax facilitated by platform-specific constraints; the democratization of linguistic authority through network-driven, bottom-up innovation; and the long-term evolutionary implications of digital code-switching as an emerging literacy competency. The analysis integrates empirical evidence from corpus-based studies of social media language, sociolinguistic network theory, and recent scholarship on the interaction between algorithmic mediation and human linguistic choice. The findings demonstrate that social media does not merely reflect linguistic change but actively drives it, compressing evolutionary timescales, redistributing prestige, and generating new hybrid registers that challenge the prescriptive boundaries between formal and informal communication. The study concludes with a discussion of future research directions, including the emerging role of generative artificial intelligence in shaping human linguistic production within social media environments.