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Maybe the problem is with your ad. Maybe you need to be more specific about what you're looking for. Maybe you need to create a "barrier" of mentioning a security deposit, to weed out low-end people. In my experience, it helps to only list your telephone number, not an email. Also, you could try posting the wording for your ad in the Craigslist forums and asking if they have suggestions for your phrasing. If you're hoping for someone young, post on websites for university graduate students.
If you do use facebook, post a status message asking if anyone else is looking. I'm surprised more people dont do this actually instead of emotional tirades:-) :-)