I know this is a forum, and that punctuation is used to a greater or lesser extent by various posters because of the more informal nature of the media and that auto-corect can be responsible for a lot of errors if you don't proof read. However, I'm surprised at posts I've read that have garmmatical errors in. The one that sticks in my head at the moment is the 'you and I' rule. A few teacher posters had put 'me and my colleague' or 'me and my boss' on a thread I've just been reading. Is it dialect in some areas to use this phrasing, or just incorrect?