This phenomenon is not new; the love of drama that even common and routine trauma leaves many people with makes these sorts of attractions to diagnoses very appealing. I once hung out a lot with a class of masters students in experimental psychology and they all went thru evaluating their own minds thru the lens of various pathologies.

My own childhood included the relatively common experience of being sexually assaulted by a relative and being threatened with death if I talked about it, and as a young adult, while I never quite believed I had MPD, I read so many books by and on multiple personality disorder, and took both comfort and inspiration from the stories.

Like so many other things in our human society, networked technology is making this part of society more visible.