I have one million Facebook email addresses

So, how can I monetize them?

Do you mean [email protected] emails?

You can't do a shit with them...
Even if you directly message them, your message will never inbox, but it will go to spam folder and in the best situation will go to other folder.
If you try to add them as friends, importing them separately to different fb accounts, your fb account will be blocked instantly...
This is what happened when i tried this methods by myself, other methods I don't know...
Cheer