Twitter was created by its users, who invented features like the retweet and hashtag. These features helped create vibrant communities like Black Twitter and Comedy Twitter, but eventually, some groups exploited Twitter’s virality in order to intimidate and harass others online. In this episode: how Twitter became the best and worst place on the internet.

EDITOR'S NOTE: This episode contains descriptions of sexual harassment and of graphic threats of violence. This section begins 9 minutes after the midroll break and lasts for about 5 minutes, or approximately 35:30 through 41:20.

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