'Correct' language is determined by usage. If something is commonly used by a group of language speakers, that is the correct usage within that language. If you

'Correct' language is determined by usage. If something is commonly used by a group of language speakers, that is the correct usage within that language. If you want to be really pedantic you can say that it forms a particular dialect, just as teenagers in school and presenters at an academic conference may both speak very different but equally correct forms of English within their dialects