I think these articles are related. I hadn’t heard of gab until now either, but after the synagogue shooting these articles brought attention to the fact that gab was one of the social media sites that the shooter frequented.

https://www.npr.org/2018/10/28/661532688/a-look-at-gab-the-f...

https://www.nytimes.com/2018/10/28/us/gab-robert-bowers-pitt...