There is some detail in https://www.facebook.com/notes/philip-su/building-video-calling/10150229123673920 https://www.facebook.com/notes/philip-su/building-vide

There is some detail in https://www.facebook.com/notes/philip-su/building-video-calling/10150229123673920 https://www.facebook.com/notes/philip-su/building-video-call... about how the interface between Skype and Facebook works and about the browser plug-in behaviour.