Over the years and it's not just here, I see people constantly avoiding posting their VIN. Hell people will go so far as posting the last 6 digits, but then "X" out the last 4. For example they will post "23XXXX".
Why? Anyone and I mean anyone with eyeballs can see your VIN through the windshield, right along with the make, model, color and license plate. What are people afraid off?