Are social intelligence and emotional intelligence the same thing?
These terms are defined by the underlying theory of Intelligence.  For example:


Social Intelligence (SI) comes from a definition by Edward Thorndike in 1920.
Emotional Intelligence (EI) (or EQ - Q=Quota) first appeared in a 1964 paper by Michael Beldoch, later by Goleman.
Then there is Interpersonal &amp; Intrapersonal Intelligences from Howard Gardner's Multiple Intelligence theory.


Generally speaking, they pertain to similar concepts with some overlap from theory to theory.  When speaking of this type of intelligence it is often recommended to cite the theory the discussion is based on.