Twitter users have been reacting to former England striker Stan Collymore's call for the social networking website to do more to combat racist and other abusive tweets from internet "trolls".
Respect to @stancollymore for speaking up about the continual racist abuse he's suffered on Twitter. It's completely unacceptable.
Sometimes @stancollymore annoys me on the radio. Sometimes on twitter too. But I have to admire him for fighting back at the mindless racist
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