I think its just for study purposes I guess. Mark Zukemberg has a lot of money he can create many coins as he wants. He can even but the whole litecoin in my opinion. LOL
Maybe... but... how long to create a new coin and logistic, wheather to low temperature..its not so easy.
And, if have a good negociation, why not.
He say that want to join this market... he can just use this tech.
I think its very probabily Litecoin could be his choice.