Libra Coin is not connected to Bitcoin in any way. The only thing similar between Bitcoin and Libra is the fact that they are both secured by a blockchain and function as a store of value.
Instead, Libra is Facebook's own Blockchain backed asset which will work as a multipurpose crypto asset, similar to Ethereum, but used moreso on the Facebook social network platform.
And how did the first blockchain come to life? What is the first blockchain which facebook is copying used for? They could have used the name but didn't want to to cout ties with decentralized crypto. It's even better and more healthy for bitcoin. I wouldn't want to be associated with centralized shitcoins too.
My favorite thing about Libra thus far is this:
"Facebook is setting up a regulated subsidiary, called Calibra, that will provide access to the new currency and will separate financial data from other “social” data that Facebook uses on its platforms."
This means your Facebook data will be stored within a secure blockchain in the future which will help to avoid scammers, phishing attempts, stalking and other nuisances currently present on social media platforms and increase the amount of utility within messenger, groups, etc.
And why should we care? People who value their personal data don't use facebook. If you are using it your data is already sold or stolen. This blockchain facebook will only benefit newcomers.