In several posts I have mentioned how I dated a Cluster B for a couple of years and the hell that went along with it. However during that course of time I read an enormous amount of material and applied it to identifying other Cluster B's in my life or on the periphery of my life. After dumping my first BPD-ex, I ended up hooking up with one other Cluster B, only for the sex and only for a short period of time, simply because she was hot. I identified her condition by her constant posts on FB about what chronic condition was affecting her and the treatment she was receiving, her instability with whatever guy she was dating at the time (which was consistent and volatile over the course of ten years into her late 20's), and by the fact of how our shared friends constantly called her "crazy" and "violent". Sure enough, she treated me like gold in the first few months, and then the mind-games began and I immediately ejected. So that was two full fledged Cluster B's that I have fvked. Since then I enjoy spotting them in the wild or amongst the people I already know. I have very high suspicions on three others on my friends list in FB.....again mainly by their medical issues, violent behavior, and constant volatile short lived relationships. Today, I just had one of the suspicious ones become a near-certainty, we are talking 99.9%. She posted this. Now others have posted this exact picture saying how brave she is, but only this girl posted her own diatribe about not onlly how brave this girl is, but how she also cut herself for 30 years, etc,....I graduated with this girl and NEVER would have guessed she was a nutcase back in high-school Based on the number of those people who I am highly certain of Cluster B status, and the general number of people I interact with in my life, it further confirms for me that about 4% of women are afflicted with this awful disease. If you have friends who constantly talk about their medical issues, recognize that this is one of the best identifying symptoms for a Cluster B girl, it has not failed me yet. It doesn't guarantee she is a Cluster B and not all Cluster B's will exhibit this behavior.....but upon discovery of this, be sure to wade very carefully and try to investigate more. It could save your life and your sanity.