“Many of these posts look like they’re probing for answers to security/verification questions, but the ugly reality is that your passwords are nearly worthless.”
The “what was your first car” memes are not after your bank password. Stolen passwords sell by the million for a few thousand dollars. Your age, hometown and tastes, tied to your friend network, are worth far more to someone building a targeting profile. Someone is paying affiliate networks to push these posts. Every answer in the comments is free data.