here is nice article about the key differences between Libra and Bitcoin:

https://seekingalpha.com/article/4271247-facebooks-libra-vs-bitcoin-5-key-differences

beside that the view on libra should be a bit differentiated. Beside FB making a big step into the market of financial service providers and the inherent concerns about privacy my personal main concern is how governments will react to that...more concretely what "chances" will governments take out of Libra.

Here in the EU there are thoughts from politicans that the EU could make an "EU-Coin" in comparison to libra, which will have the effect of "cash abolition" and make the citizens absolutely transparent in every aspect of your daily life. So my deepest fear is not FB, beside i didnd´t like the company and model at all, but governments, which could use Libra as a trojan horse for laws and monitoring. There should be the key view of the further developement!