Sociopaths are manipulative, and some are dangerous. If you know someone with several of the following attributes, your best bet is to stay away from them.
1 Superficial Charm
3 Pathological Lying
4 Manipulative and Cunning
5 Shallow Emotions
6 Lack of Remorse, Shame, Or Guilt
7 Incapable of Human Attachment
8 Constant Need for Stimulation
9 Lack of Empathy
10 Poor Behavioral Controls / Impulsive Nature
11 Promiscuous Sexual Behavior / Infidelity
via How to Spot a Sociopath: 11 Signs & Traits of A Sociopath.