Scully,
Good points and very interesting info given on the Munchausen by Internet.
I know well what you call of past experiences on JWD. What happened there were several posting identities all run by one person i.e. he had several identities, all of them participating on the board, lives full of dramatic episodes, gaining much sympathy from good-hearted members of JWD. The truth is that we are so used to the assaults of the Borg, that we are ready to offer support to others who have also suffered. Therein we can become gullible.
You ask what to 'look for' and I'd answer by giving a hypothetical example:
Both Mrrs Ozzie and I are registered posters on JWD. Mrs Ozzie has not posted for a long time but many will have noticed that I often speak of her. The question is, Does she exist? Is she a 'real' person or is she simply a figment of my imaginative posting?
I choose to remain fairly anonymous and so I never post a photo likeness of myself, nor of Mrs Ozzie. So, are we frauds? Could be.
Of course, many here do know us in real life and many here know more of our personal lives and know what we look like.
Still, there's a possibility that I could have concocted these identities long ago. I would think though that it would be too difficult to maintain.
The Munchaussen by Internet you mention lists things such as this:
Under the guise of illness, they can also join multiple groups simultaneously. Using different names and accounts, they can even sign on to one group as a stricken patient, his frantic mother, and his distraught son all to make the ruse utterly convincing.
With this inevitably comes 'crunch time' as we found in a previous experience on JWD i.e.how are such episodes resolved? The story comes to an impossible point when the fraudster is simply unable to write the story any further.
The clues to detection are interesting (we've seen it before!) particularly this:
there are continual dramatic events in the person's life, especially when other group members have become the focus of attention;
and
others apparently posting on behalf of the individual (e.g., family members, friends) have identical patterns of writing
In short, regrettably perhaps, it's a case of "let the buyer beware" as far as internet relationships are concerned.
Be absolutely sure that your friend is who they say they are before you divulge personal information.
A photos certainly helps. If its like Mrs Ozzie and I, then get a photo of the pair of us together.