I think diagnosing someone with a disorder over the internet is borderline impossible.
And maybe this is a product of me reading biographies about too many serial rapist and serial killers but... Some of the most 'notorious' psychopaths in history were so very successful at getting away with their crimes long-term because of how normal they appeared on the surface - their acquaintances and neighbors usually never had a clue. Given their manipulative nature... Especially with a medium like the internet to hide behind? I'm convinced you'd never know.
I think a lot of the people who 'act like' sociopaths on the internet are just in it for attention.
I've known two guys who I'm highly suspiscious of Patches but I've never been able to get proof or evidence beyond the suspiscions.
Evil fuckers, one of them tried something on me while I was drunk once and I'm a big guy, I wasnt as drunk as they thought I was thankfully and its one of the reasons I dont drink alcohol like that any longer, it happened some years ago now but I've not forgotten it. This guy is a strange character whose messed with drugs and alcohol and joked about how if he was going to molest and kill someone how he'd go about it. He was one of two guys who talked with some authority about the length of time to restrict someones breathing by holding their nose and mouth shut in order for it to result in brain damage and how much longer for it to result in death.
The other guy is a complete and utter menace, engages in lots of head games with people, lots of power struggles which are quite calculated and long term in their unfolding, while all along lots of other malicious or criminal actions, stealing copper piping from a workplace for instance, pretty sure of that one, poisoning someone or causing others to get sick, pretty sure of that one too, petty theft of a sat nav, swapping worn tires or batteries from his car into other peoples vehicles, things like that and on each of these occasions I think that they've been pretty devious, setting others up or attempting to do so, this guy has done things which not just myself but others have witnessed and I believe its almost enticing others to try and catch him. Like I did it, you know I did it, try and prove it now sort of thing. I'm as careful as I can be of the guy and dont believe that's any real protection what so ever either.
The later case, the one which I think is the worse guy, I've seen exploit any perceived weakness in others and despise any sort of emotional vulnerability, this can play out in telling people who've got cancer or something that they are not going to get better, that they'll only get worse, there's no God, there's no hope, stuff like that but, interestingly, those who're most like him but not as clever are special targets for him and I've seen him report one or two guys usually with applause from others, which results in temporary changes in his "ratings" with them.
One of them of them is a younger guy and the other is an older guy, in some ways I would consider each of them, largely by their associations, as legacies of the Irish troubles, I'm not sure if they've paramilitary backgrounds or if they were the sorts of criminal element which used to operate or thrive in the kind of atmosphere the battles between the paramilitaries and authorities created.
Those kind of guys are scary and I've got to say that while one of them I'm pretty sure is a hacker neither of them would be interested in the internet, definitely not anything so mundane as targetting people on a forum or winding people up or trolling, unless it was a minor spring board to off line stalking or something like it. Something I found interesting about each of them is that they're incredibly techno saavy but the motivation in being techno saavy is about power in each case, not knowledge or curiousity or competence or anything like that but power, ie others are not techno saavy and being techno saavy provides opportunities to take advantage of others.
Knowing those guys and then reading books on sociopathy or other theories, whether its pop publishing or text books, I'm always left thinking "that's them", "that's them aswell" when I'm reading them but I'm also aware that its possible to engage in confirmation bias that way too.