blog vs opinion

blog

noun
  • A website that allows users to reflect, share opinions, and discuss various topics in the form of an online journal, sometimes letting readers comment on their posts. Most blogs are written in a slightly informal tone (personal journals, news, businesses, etc.) 

  • An individual post to a blog. 

verb
  • To contribute to a blog. 

  • To blag, to steal something; to acquire something illegally. 

opinion

noun
  • A belief, judgment or perspective that a person has formed, either through objective or subjective reasoning, about a topic, issue, person or thing. 

  • a judicial opinion delivered by an Advocate General to the European Court of Justice where he or she proposes a legal solution to the cases for which the court is responsible 

  • The formal decision, or expression of views, of a judge, an umpire, a doctor, or other party officially called upon to consider and decide upon a matter or point submitted. 

  • The judgment or sentiment which the mind forms of persons or things; estimation. 

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