What is Gab, the social network used by the Pittsburgh synagogue shooting suspect
Just minutes before one of the deadliest attacks on Jews in America's history, the alleged shooter posted a message to Gab, a social media network known for attracting white nationalists and the alt-right. So, what is Gab, and where does it fit in the big picture of online hate?
Slate's tech reporter April Glaser explains how it works.
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