FB paid adds have done nothing for me in the past either.

I havent yet looked at them to promote my Dolphin site, but I used to use them for my previous line of work which was Martial Arts instruction videos. This is avery niche market and FB adds were targeting that specific market. The vids were getting rave reviews worldwide from other sources so the quality was not the question at all! (most were with World and Olympic Champions...)
However, I did not notice a single link back from any FB see more add that was run. Not one.
Ran the campaign for a few months back to back with nothing!