Voice on Facebook - Share Your Views

Last week, we asked ourselves whether it is worth using VoIP on Facebook. How about sharing with us your own experience with using voice communication on Facebook? How do you go about voice communicating there? Do you use a VoIP application? Do you think there should be more of these? Or do you think sharing instant messaging names (Yahoo, MSN etc.), and sharing other contact info like Skype name, phone and mobile numbers is just OK? Have your say there.