I do it for the AI imbeciles. hashtagging increases indexing on
   various aggregators. _sometimes_ I'll use it for a quick search
   but rarely. Always promoting something somehow, usually just
   'me'. But really, I think of the computers. They need keyword
   food. == They're actually really great for organizing
   information that's produced in a non-linear fashion. For
   example, on Vine, the [1]#followKennethUdut hashtag is one I put
   on comments to people who give me "shoutouts" or say something
   nice about me, or tell people to follow me. Then, at a click, I
   can quickly gather together all posts from everywhere on the
   subject I choose over whatever course of time by whatever source
   person. It's quick and dirty. Serves a good purpose when used
   properly. ==

References

   Visible links
   1. https://www.facebook.com/hashtag/followkennethudut?hc_location=ufi