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The feed link for listings has this format:

http://appthemes.com/listings/feed

The message you see is normal and you get that with every xml feed.I don't know how you're planning to use the...

App themes wrote a good tutorial on this. I've tried it and it works really well and is pretty easy to set up.

http://docs.appthemes.com/classipress/auto-post-to-social-networks/

Have a look here. It should give you an answer.
http://codex.wordpress.org/Function_Reference/the_date

I haven't tried it but maybe put this somewhere in single-listing.php

<p>Date posted:...