Elon Musk is the antithesis of a "random person on Twitter." He's the CEO, and one of the richest men on Earth to boot.
I don't have any particular need (or interest) in knowing where Elon Musk is. I also don't know where he is at all times with the information in this flight tracker: I only know the parts that are already necessarily public.
Law is fundamentally casuistical in nature: there are standards that apply to John Q. Publics (like you and me), and there are other standards that apply to the Barbara Streisands (and Elon Musks) of the world.
2. In such a case you have a need to know that supersedes one's right of privacy. Are you saying you have a need to know where Elon Musk is at all times?