Kip Call is a service that lets you phone the people you have befriended on Facebook, regardless of having their telephone numbers or not in your address book. This service works on any browser, and at any time – no WIFI or 3G is required.
The phone numbers are retrieved via MobileGlobe, and the connection is handled using PSTN (Public Switched Telephone Network, a service available both in the United States and in Canada).
All you have to do is get the application at the App Store, add your friends to your Kip Call list, and upon doing that you will be able to begin calling them up from your iPhone.
As it is only suitable, users of Kip Call can decide who is able to call them and who is not. And as a bonus, Kip Call lets you send emails to the actual inboxes of your friends. So, as far as letting you stand communicated with the people in your life is concerned, this is as comprehensive as it gets.
KipCall.com In Their Own Words
Call your Facebook friends without having their numbers at any time.
Why KipCall.com It Might Be A Killer
An application like this one gives a true new depth to interactions on Facebook.
Some Questions About KipCall.com
Will we ever see a service like this one in countries other than the US and Canada? 
