Troll alert tool banned by Twitter
Twitter has shut down a crowd-sourced effort to expose fake accounts posting racist messages on the social network.
The Imposter Buster bot automatically replied to tweets posted by fake accounts, to warn other people.
However, Twitter suspended the bot after a large number of "spam complaints" were filed against it, according to the New York Times.
"Impostor Buster was doing Twitter's job for it," said writer Yair Rosenberg.