One of the best ways to promote your website especially if its a new site is to let the world know about it through as many channels as possible, one such channel if you run a free dating site is through a blog. Get in touch with bloggers and let them know what is unique about your site. That is exactly what Free Online Dating Site has done, they contacted Top UK Dating Sites to let us know that their new blog announcement services for free UK dating site is in place so if you have a dating website that allows members to register and meet potential date without payment then you need to get in touch with Free online dating sites to announce this. The service is free, to make use of the service you need to contact free online dating site via their contact page which can be found here.
Freeonlinedatingsite.org
October 16th, 2009 
james idoko 
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Hi I setting up a dating site and would like some other ideas of getting traffic to the site, what works best for you?
You have started on the right track, go to as many dating blogs as possible and participate as a commenter, that will help get your site some recognition as a dating site which will translate to better SEO ranking. Do other search engine friendly stuff to your site including building backlinks and of course, use PPC to get the kind of traffic you are not getting organically.
There is a dating section at a webmaster forum called Webmaster Serve, you may want to participate there, you will meet other datingsite owneres: http://www.webmasterserve.com/dating-site-forums/
Good luck