And not in the way we usually say companies "conquered the world".
I mean they already own our social network (ie. all our friends and relationships) and have become the only way that people can talk to each other. Now they will become money and be the only way people can pay each other.
I don't have a FB account. That means I am continually excluded by default from a range of things that people send information about. I miss events because they are posted on Facebook and Instagram and nobody remembers to use an alternative channel which I might see.
Tomorrow I might not even be able to be paid without being signed up to have Facebook as my Identity Provider.
With Uber signed up, I might not even be able to find work without Facebook's permission.
Here's a hint to the nation states of the world. If you want to still be in business in 20 or 30 years, ban Facebook Libra NOW!