This is great news! Facebook is more influential than any other network nowadays, so this will really help making crypto more and more popular.
Nowadays there are lots of news coming about crypto currencies which means the world is getting noticed about crypto more than before and spreading the positive news like this is really helpful for the growth of crypto prices.But Mark Zuckerberg didn't speak lot about crypto currencies on his post,he is just talking about new technology so he said about centralization vs decentralization.But I am sure they didn't allow crypto as their mode of payment because I am running a big facebook page with 700K followers,when I try to promote a post the available option is fiat currency over debitcards.