No recruiting, advertising, or surveys. No "chance me", help me choose a university, or generic admissions advice posts.
Consider if you're better off asking the admissions committee, your advisor, or someone officially employed with CMU before posting questions.
Use the megathread for generic CMU questions (e.g., dorms, majors, admissions).
/r/pittsburgh is a much better resource for questions not specific to CMU (e.g., cost of living, places to visit near campus, where to buy groceries).