Tumblr is not what you think

I was wondering why tumblr search is so bad and primitive. May be this is a correct answer to that

• A large percentage of Tumblr users actually don’t WANT an audience. They do not want to be found, except by a few close friends who they explicitly share one of their tumblogs with. Therefore Tumblr’s notoriously weak search functionality is A-OK with most of its user base.
  
• Tumblr is actually Facebook 2.0! As Facebook has become a real-life social network infested with parents, co-workers, ex-friends, and people you barely know, Tumblr has become the place where young people express themselves and their ACTUAL INTERESTS with their ACTUAL FRIENDS. 

Tumblr is not what you think