FaceFlow for BB10 and Playbook
Ok i just tried this service and it is great over WIFI.
For BB10 there is the app for it, but for playbook you need to go and use the browser so you can faceflow anyone on your faceflow contacts, but you can also ue your PC browser to login and faceflow anyone a message only, but not call them or audio message them.
Free Video Chat - Quick & Simple | FaceFlow
This is a great app much like skype would be, but better i think and better then facetime on iphone as iphones app only works over WIFI.
FaceFlow works over Mobile Connection as well, little choppy if you connection is slow.
Best over Wifi though.
This is a great alternative over BBM playbook and Z10 on same BBID not work, well you can call the Z10 from the playbook, but not from Z10 to playbook on Same BBID.