Don’t see why the judge is concentrating solely on this person. All he has to do is contact FB reps and issue a Court Order for the guy’s password.
At best, I would put up a fake account so others could post to it, but for no other reason would I do it since I know it could be compromised at any time.
I use Linkedin just for professional reasons to keep up on flying jobs, etc. That’s the sum total of my social interaction with people in my field.