I felt like, given the audience (facebook), I would come off as nosy and pretentious by spouting regulations.There is a middle ground...
While holding back on reporting to authorities, you could publicly comment on the post with citations for section/chapter in the regulations for what is being clearly violated.
He may be totally dismissive (that's what I'd expect), but others would be educated, and FAA bots might find the discussion on their own. Also, he may have better angels that do kick in. You never know.
That's the "civil" way to do this, free of Soviet report-on-your-friends style behavior...
Instead, I asked him how hard it was to get the waiver for that flight, which I hoped spurred discussion.
Instead he blocked me, and I see he has posted he will be putting more clips up soon, which tells me that he is unconcerned about his actions being reckless and potentially not legal.
I really didn't intend for this to be my windmill to tilt against. For now I've adopted a wait-and-see attitude towards it. If he persists... guess we'll see