[msencenb]

I wouldn't give up on your current strategy it will probably just take a little time.

Another alternative would be to try some ads on google, facebook, stumbleUpon, etc. If you do this it is probably worth it to keep your budget really low ($5 a day) until you get a feel for the keywords that get you real users for the least amount of money. I believe IMVU did a great job of this in their early days.

Also you probably already know this but be sure to e-mail your existing users. I got an e-mail from a Cloudkick co-founder about 2 days after signing up for the service that added a personal touch and showed that they actually cared about my feedback.