The wife of a very close friend of mine had a very messy fight with her sister that resulted in a family break up (they basically stopped all communication). Now this person has always demonstrated symptoms of NPD from what I have read, but I did not know this at that time. This break up that occurred was not supposed to be public knowledge, in fact this person compartmentalized quite a bit of information. You never knew who could know what. If you accidentally shared something that was not perceived as permissible by this person, you were "punished" (verbally and even passively).
One day, about a month after the break up, I noticed several posts on Facebook where the wife supposedly got together with her sister. This struck me as odd since my friend had expressed how unhappy he was with his sister-in-law within the last several days, so I called him. When I asked him if they were getting back together, he replied that I was the second person who had asked this, and that nothing had changed in regards to the status of the broken relationship, and he knew that his wife had not even spoken to her sister, let alone got together with her. He then stated that he was going to talk to his wife about this, again.
Ever since that day, my wife and I have been pushed away. There has been much passive-aggressive behavior from the wife that it has made it all but impossible to even communicate civilly.
So my question (after the long explanation), is it common to have Facebook as a location where people with NPD verbalize their fantasies out loud?