Facebook is trying to clean up their act, believe it or not that is a good thing.
So far as decentralization of social media goes... @ned clearly describes Steamit well "Steemit is a centralized website sitting atop a decentralized protocol—that's steem"
The point i'm highlighting here is that it's not practical to "deventralize everything" which is why EOS IO, for example, has a custom application infrastruction framework. Ironically Block. One the company developing the EOS IO software uses "Decentralize Everything" as a slogan!
It's not, imo a struggle for freedom or privacy that is generally a choice and most choose the social platform with 2+ billion active users over the less popular under 1 million user platforms, regardless to the underlying technology.
There are other incentives such as monitization those which are different from a user and advertisers perspective and here we can agree as Facebook taking a hit on advertisement revenue combined with it's own interest in exploring cryptocurrency and blockchain tech as announced in it's new year statement could be an indication of it paying close attention to user growth stats across various platforms.