For Facebook to be truly decentralized they'd have to adopt a Steemit like system. I have no idea how they'd achieve this considering they have hedge funds holding billions of dollars in their stock. How will they convert to cryptocurrency instead of a stock structure? These hedge funds arnt even able to hold crypto in their portfolios. I think it'll be a big challenge for Facebook but they don't have a lot of choice because the Steemit business model is far superior to Facebook's revenue dependant model, in creating a unsensored better user experience.