They should its the future, I bet they make their own coin.
The Facecoin?
As I have learnt FB is already having Facebook credits, which is equivalent to centralized pre-mined alt coin.
this makes a lot more sense then the face coin as you know that fb credits cannot be 51%ed
Yes, because fb credits are 100% controlled/owned by the FB.
The basic difference is that that is not de-centralized and hence does not depend on cryptography.
Facebook doesn't really have any reason to need to depend on cryptography when dealing with it's credits. Users ultimately need to pay facebook for the paid services that they will provide (likely ad) and will need to trust that facebook will follow through.