HI I just started a free online dating site this month. I am on a very limit budget (less then $200 a month) for advertising my site... Where should I spend my money for advertising?:
You could try PPC, but your in a highly competitive market, it's really going to really cost you for clicks and if you don't convert well you could loss all your money very quickly.
On the other hand there are many ways you can promote it for free, well besides your time.
Hire someone to build quality links for your site. With that kind of budget, you can hire an SEO expert to promote your site. Getafreelancer.com would be a good place for that!