A、They can’t stop terrorists communicating through this channel. B、They didn’t adjust their policy over the past year. C、They di

Twitter has changed its policy and is taking steps to identify people who post hateful and violent speech and kick them off the social network.
    The statement comes amid growing anger that terrorists use social media to post hate speech and recruit.
    Twitter’s new policy gives the social network a more explicit ability to suspend or shut down accounts of people who engage in "hateful conduct" or whose "primary purpose is provoking harm towards others". In the past, Twitter said it banned the promotion of violence and terrorism, but it did not say people who posted hateful things could be banned from the network.
    Another update bans people from using multiple accounts for the sole purpose of avoiding suspension. That’s a method terrorists have used to stay online, even if Twitter suspends one of their accounts.
    Twitter, Facebook and other social networks have faced criticism for failing to stop terrorism from using their channels to communicate. In response, the social networks have adjusted their policies several times over the past year in an effort to prevent hate speech and the promotion of terrorism.
5 What did Twitter do recently?
6 What method have the terrorists used to stay online?
7 Why are social networks criticized?