For Facebook ads, I have an interesting story... way back years when some neo-Nazis chartered a ship (the "C Star", for those who want to look it up), cruised in the Mediterranean and ended up in distress, I set up a couple ads for troll posts of mine and targeted them to followers of the German alt-right party... and lo and behold, the people flocked in with angry replies.
Best 50$ I ever spent on entertainment, and it was highly effective.
Best 50$ I ever spent on entertainment, and it was highly effective.