Has he mentioned just a few close friends, family or a long list?
Mostly close but a couple that are often associated with her on facebook..

Has he sent nude proofs/ no nude images to her?
Yes.. And started sending to others..

Were any of the non nudes uploaded to her facebook account?
No

how long as the threats of blackmail been going on?
Since January..

who was the Vpn provider, they may keep logs.
Hosting Services, Inc.

Have you reversed image searched the nudes/ none nudes for any results.
Yes, no results..

Is she friends with the blackmailer on facebook?
Have not accepted his friend req but that is where he is contacting her and others..