Many seem to claim that using these methods are manipulative. One could also argue that knowing these methods put those that lack inherited social skills, or find it scary to interact with others, on equal footing with those that use these techniques naturally. Look to someone you think is killing it in all social circumstances without effort. These people will smile (with both the eyes and mouth), show interest in others and mirror the physical behavior of their talking partner. Most of these people aren't trying to manipulate. It comes naturally. You could improve yourself to just become a natural by realizing these signs.