"If your selling a car on Craigs list make sure you spell at least the name of the car correctly or you make yourself look stupid. Chevy isn't spelled Chevie..."I suppose that people who cannot properly distinguish between "your" and "you're" don't make themselves look stupid at all. (Not to mention the fact that Craigslist, last time I checked, wasn't two words, but that's less egregious of an error.)
Which brings me to a question/pet peeve. Why can't the average native English speaking, college-educated, monolingual adult in this country use proper grammar/spelling at a fifth grade level? I don't mean making occasional typos or mistaking "your" for "you're" once or twice because you're typing emails at 4 a.m., but really not knowing the difference to the point that you post 14 FB status updates (not that I'm counting), all with the same damn mistakes. Which means that you really don't know that cannot is one word, or that it's is not possessive, etc. I swear we learned this back in fifth grade, or maybe even third grade. Why aren't they teaching this and drilling this ad nauseum in the schools?
It's not like I expect people to know that peruse actually means "to read carefully" or that comprise, used in this context, is incorrect: "The orchestra is comprised of fifty gazillion trombones and two oboes (oboi, if you prefer Italian)" Or that data is a plural noun. That is a should-I-buy-the-Fowler-or-Garner-style-guide?- level nitpick. (Aside answer: Get the Garner. It's very practical, and it's not the annoying prescriptive style editing that I find really narrow. It's really ok to end a sentence with a preposition, as Winston Churchill has once pointed out. )
But you're/your? They're/their? Too/to? C'mon people. Every native English speaker over the age of 11 should have mastery of such basic grammatical concepts.
(Update: I am in the middle of exams, so I am not moderating any more comments on this post! Sorry. )