Mark Zuckerberg himself seems to understand the importance of privacy very well, taping over the microphone and camera on his MacBook Pro, keeping his trash can from being scavenged by others, and FB spending heavily to protect his security, so why does he have the exact opposite attitude towards others?
In practical terms, Mark is a target. You're not.
Define the word "target".
I would argue that for the likes of Facebook and Google, they consider anyone fair game.
Of course they would never use the word "target", but ...