extrovert vs social butterfly

extrovert

noun
  • An extroverted person: one who is outgoing, sociable, and concerned with outer affairs. 

verb
  • To turn or thrust outwards. 

social butterfly

noun
  • A gregarious person who likes to attend parties and other social gatherings; a people person. 

How often have the words extrovert and social butterfly occurred in a corpus of books? (source: Google Ngram Viewer )