system
A chat on subreddit /r/wallstreetbets
human
I legitimately cannot see what possible revenue Pinterest can generate that would make it an attractive stock to own and hold. 
  
 Sure there are similar entities to it and social sites, but they do what Pinterest does better.

gpt
Premise: most Pinterest boards are wishlists. Connecting all those pins to buy buttons would bring in money more directly than pretty much any other social site.