social vs societal
Societal is the pedantic alternative to social. They both mean "pertaining to society," but as the latter word, first attested in the Middle Ages, was increasingly used in the modern era to refer to interpersonal contact rather than in the context of complex forces within human populations, societal appeared in the latter part of the nineteenth century as a more serious, scholarly alternative. It is mostly seen in such usage and is otherwise considered pretentious.
Even now, social is more likely to appear in phrases referring to individuals, not groups, such as "social disposition," "social engagement," and "social life." Societal, on the other hand, is employed in contexts like "societal pressure to conform," though social still has the same import in usage such as "social institutions," which refers to widespread traditions, not venues where people hang out.