My 2 cents:
There are rules and rules: some of them are written and quite clear, others must be found in ourselves.
It's a game based on points, but points are not all this place is about.
To be honest, I do not know.
This photos were published by an unknown (for me) man on the FB page of my friend Paul.
Apparently it was necessary to ask Paul about this photos and puzzle car..
Following this logic, if I found another photo puzzle on Facebook (or any other social network), I need to check that the person is a member of our site?
No, Dmitry, it was not necessary...but it was an act of courtesy in any case: if, like you said, you thought I was not aware of the puzzle but even more if you thought I was looking for the puzzle.
The logic is this: you find a pic in my page, you know it's an hard-nut puzzle. What do you do/think?
You think I'm in contact with someone who knows it and I'm trying to solve it and found the answer to score the point? Then you should not take advantage of that by being faster.
You think by pure coincidence and sheer luck someone just drop out of the blue in my page the answer of a puzzle and I do not recognize/know it? Then again, you should warn me and tell me that I have just been given the answer of a nice puzzle.
Hey, we are Facebook
friends after all!