Thanks for you suggestion. We have posted in facebook and buzz. Also called few friend personally. It is financial app and we ask for some data to make the decision. Since they are not users they don't feel that motivated to provide all the information. So we started targeting the financial blog to get real users.
If you can't find even 2 or 3 real users through your network of friends and acquaintances, you might be in trouble.
I'm trying to say: you should contact your first users personally. Find them. Ask them if they mind using it. IM them. Call them. Don't just rely on some blog comments.