That isn't true.
The copyright to derivative works is owned by the copyright holder of the original work. However using illegaly obtained copies to create a fair use transformative work does not taint your copyright of that work.
> Even if not, you agree that they infringed on copyright of something close to all copyrighted works on the internet and this sounds fine to you?
I agree that they violated copyright when they torrented books and scholarly arguments. I don't think that counts at "close to all copyrighted works on the Internet".
> The consequences and fines from that would kill any company if they actually had to face them.
I don't actually agree that copyright that causes no harm should be met with such steep penalties. I didn't agree when it was being done by the RIAA and even though I don't like facebook, I don't like it here either.