Twitter has long been criticised for its hateful interactions, but it’s not the worst. A look inside the alt-right’s answer to Twitter, called Gab, shows just how disturbing online echo chambers can be.

Created by Andrew Torba in response to claims that mainstream social media suppresses right-wing debate, Gab has a similar design to Twitter, with users limited to 300-character posts. Gab also claims to champion free speech. But the platform has evolved into a haven for hate speech, according to an 18-month analysis of more than 22 million posts by 336,752 users.

Savvas Zannettou at …