Account information from Calibra will not be shared with Facebook to improve things like ad targeting, except for "limited cases"
In other words, if you use your Libra coin to support a political candidate or cause that runs counter to the vision of the social justice trolls in Silicon Valley, you may find your account frozen in the name of "community safety" guidelines. Or if you otherwise commit "wrongthink" on any of the Libra consortium's supported platforms.