In today’s society, social media has become a site for grammatical and orthographic errors in comments under Uzbek Instagram posts, providing a window into how informal digital communication influences written language use. The findings reveal that social media discourse contains a high frequency of deviations from standard Uzbek, with subject–verb agreement errors emerging as the most common category, followed by sentence fragments and spelling inaccuracies. In addition, phonetic spelling, vowel substitution, and consonant confusion occur. The results demonstrate that users often transfer oral speech patterns directly into writing and grammatical accuracy. Such tendencies contribute to the normalization of non-standard forms in online environments. These patterns highlight the strong impact of digital practices on contemporary Uzbek writing and reflect a gradual shift toward informal linguistic norms in public online communication. While platforms like Instagram promote spontaneous expression, they also play a significant role in shaping language habits, particularly among younger users. Therefore, raising awareness about standard language norms and integrating digital literacy into education may help preserve grammatical accuracy and support clearer communication in Uzbek online discourse.