![Twitter sues hate-speech watchdog, following through on its litigation threat](https://cdn.cnn.com/cnnnext/dam/assets/230801072426-01-twitter-x-icon-super-169.jpg)
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Twitter has sued the Center for Countering Digital Hate (CCDH), a nonprofit group that has criticized the company’s handling of hate speech, following through on a litigation threat that had been publicly revealed just hours before.