nosebleed vs social butterfly

nosebleed

noun
  • A haemorrhage from the nose; usually, blood flow exiting the nostrils that originates from the nasal cavity. 

  • mental overload (usually attained as a result of having to comprehend new and/or complex concepts or languages that one is not particularly skilled with). 

social butterfly

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

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