After reading the article, I do not think he is going to remodel Facebook to resemble Steem. I do not think he sees Steemit as a threat-though he should. At best, he is trying to understand how to evolve Facebook and incorporate the blockchain to make more of a profit for his company.
I do not trust Mark Zuckerberg and Facebook. I just finised reading an article on how Facebook is collaborating with the Israeli government-a sign of a centralized social media site.