GAB is a social media site that is "friendly" and "a safe haven" for neo-nazis, white supremacists and "the alt-right". It was created because they were too extreme even for Twitter's ridiculously ineffective controls on hate speech.
They apparently believe so strongly that they are "right", that they literally forked a browser to allow their extension to be used, so that like-minded nazis and white supremacists can discuss.... how bad jews are I guess, on any site they wish.
What exactly is hyperbolic? The first sentence is almost exactly the description of GAB from wikipedia btw.