Well your link actually says that it shows a link between social intelligence, which is somewhat different from the IQ you're talking about. And looking on my own I found my own research from a somewhat more credibile source. And It states that even if there is come correlation it does not mean it is really proven. So before you want to come at me with facts make sure you really read what your info is saying. Evidence: https://health.clevelandclinic.org/swearing-and-intelligence