Maybe add to WP a classifieds? I really like the format of the one on http://vampirefreaks.com/classifieds/
Its clean, decently moderated, and effective. I am referring to the personals of course, but it could be used for more on here as well (events, for sale, etc). You do get some junk posts and stuff too, and posts that are really dumb, but theres some good ones. Maybe WP could do it similar, if not better. 18+ of course for dating.
As for the privacy issue and "predators': [swearing removed by lau], common sense. If the objection to this idea is "privacy" or "personal info" then thats bogus. Don't post or reply if you don't want to, Nobody would force you.