This article examined the impact of social media on the writing abilities of Nigerian youths in English, which is the language of mass communication in Nigeria. Deploying cultivation theory of the media, this study used quantitative and qualitative methods to unpack the Nigerian youths' opinions on the impact of the use of social media on their writing abilities, using undergraduates in Ekpoma, Nigeria as a study case. To do this, data was collected through the use of 110 copies of a survey questionnaire administered to selected students. Additional information was garnered from focused group discussions (FGDs) with students and in-depth interviews (IDIs) with some tertiary institutions' lecturers as well as the researchers' direct observation of the issue under investigation. The study discovered that a majority of the youths adopt a certain option/brand of English which cannot be located within the matrix of Standard English (SE) or even popular Nigerian English variant which is called Pidgin English (PE). Consequently, expressions such as 'u' for 'you' 'gr8t' for 'great', 'ur/urs' for 'your/yours', among other deviational patterns, have crept into their writing consciousness in classes and examinations, which make a lot of 'sense' in informal settings among the youths, but smacks of sub-literacy in formal writing situations under which they are being trained. This development can have serious implications for effective and efficient writing among Nigerian youths, especially in formal situations. The study recommends, amongst others, that further studies should be carried out on the deviational patterns of English words and phrases which are commonly used by youths in Nigeria and elsewhere, with a view to possibly getting the 'new words' standardized by the relevant educational authorities to ensure uniformity in usage, and to keep pace with the dynamically trendy social media culture.