The toxicity on social media creates victims online and online ecosystems that breed real-life hatred. Gab, a self-described “free speech” platform largely used by right wing extremists, has been the preferred platform for hatred and vitriol. Users include Robert Bowers, who posted on the site just before he massacred congregants at the Tree of Life Synagogue in Pittsburgh.
https://www.adl.org/blog/when-twitter-bans-extremists-gab-puts-out-the-welcome-mat