Microsoft is more interested in supporting decentralization and if you read some of their announcements, they stated that they will build on IPFS (the protocal that @dtube is partly based on).

Secure messaging can be built on top of the Steem blockchain through Dapps (i.e. @partiko ) and if you read one of the announcements by Mark Zuckerberg he said that Facebook represents the "Townsquare" (Public) and that he will build new apps with End-to-End encrypted messaging (Private).

I see no reason why Steem based Dapps couldn't do the same and I believe successful centralized companies that cannot compete with Facebook and YouTube will eventually launch Steem based Dapps.. not everyone but at least some of the semi-popular social media networks that cannot compete against Facebook.

#SwitchToSteem