Self-professed psychopath Jacob Wells posted his advice on Quora

He described how he befriends people then uses them to his advantage 

Description matches psychopathic traits such as charm and manipulation 

Like Patrick Bateman in American Psycho, psychopaths can be intelligent and charming, while hiding a lack of empathy.

So given their ability to manipulate others, how easy it is for you to spot one? 

Self-professed psychopath Jacob Wells has revealed how he behaves in different situations and has listed questions that may help others identify whether they have any psychopathic traits - as well as recognise them in others.