Ill give a concrete example: I have a lot of followers on Vine.
  I didn't know who my audience was going to be; I just take my
  6.8 seconds and fill it up with whatever is interesting to me at
  the time.

  Over the past two years, I got a number of shoutouts from
  people. These are the people who say, "Go follow Kenneth Udut"
  or "Kenneth Udut is awesome!" I would _never_ have guessed when
  I started they're'd be so many kids; I'm 43; I expect my
  followers to be in their late 20s and beyond. I didn't KNOW over
  1/2 my audience was going to be kids when I started, because it
  was supposed to be a 17+ service, but since they found me, and
  liked me, I just go with it, and so I always keep them in mind,
  although I don't really change what I do; I was just surprised
  at the amount of eyes and the ages, because really, they're NOT
  supposed to be there.

  But, since they are, it's nice to be heard.
  [1]https://vine.co/v/eIqtMJbZlrL

References

  Visible links
  1. https://vine.co/v/eIqtMJbZlrL