Which PPC is the best for this kind of service, atmynumber?

I just opened up a website, and trying out Google and Facebook PPC marketing.
http://www.atmynumber.com
It’s a service which lets you integrate phone numbers to email, but instead of creating a new email account, it only forwards it to your main email account. Very useful in sharing email addresses over the phone or in public.
Anyways, unfortunately, this kind of services hasn’t widely been used (or even been tried yet), so the quality of my keywords are very poor. This results in not showing the ad’s.
Interestingly, people who comes into the site, they all seem to join (according to our site visitor vs members) our service, but because they are not showing up at all on the Google or Facebook ad’s, I can’t get any views!!
Which of the PPC marketing would you recommend?
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See original post by qgeorge